Pokemon seems to be a common one mentioned.

I'd like for them to make it a bit more 'mature'.
As in catering a little bit less to the absolute youngest, and raise that a bit to say 11 years old. The youngest would probably still enjoy it and not notice a difference.

Some of the things I'd like to see change is how every character you meet doesn't have to worship you like a god from the moment you first step out of your town with your lvl 1 Metapod.

"I've now seen the light! Thank you for showing me that I should peruse my dreams."
"Wow, you're strong! I think you have what it takes to beat the Elite four."

Save those types of comments for when you beat your rival, or win a tough/important fight.
Even small kids don't need positive reinforcement on that level relentlessly at virtually every point in the game.

It's not a small game.

And there's no way they could have fit everything from the original in this kind of fidelity, even with the insane budget this game already got.
Because the original game was using way too many shortcuts in order to artificially expand the scope of the game, far beyond what was actually possible for a game in 1997. And especially today when everything has to properly function while in high fidelity.
Not knowing that they'd have to remake it 20 years later, they painted themselves into a corner with all the pre rendered backgrounds, CGI Midgar, fixed camera hiding the fact there's nothing but empty space around you everywhere aside from the world map, houses only having 2 walls and no ceiling, world map was lego sized, invisible enemies, etc.

While many games at the time used similar shortcuts, few used as many, and even fewer did so in order to expand the scope as broadly as FF7 did.
And now they have to remake it in high fidelity when none of those shortcuts would be acceptable.
I'd say even just remaking what was in the original (which wouldn't be a functioning game because every house would have only 2 walls and no ceiling, nothing but black space surrounding you with a fixed camera, etc) may not be reasonable to expect. And they had to do way more than that just to make it a functioning game in real time.

There were ever only 2 choices.
Get to the end of the story in one game, while missing a lot of important things people loved. Or make it a multi game series.
The new additions to FF7R is not the reason it's a multi game series. It had to have been regardless. Whether it impacts the numbers of games we'll get is impossible to gauge at this point. But this idea that we could have gotten one game (that fans would be happy with) was never realistic.

FF change direction at every release.

There has not been a Final Fantasy game with a "pure" turn-based battle system since Final Fantasy X in 2001. In fact, an even better thing could be to bring the good old ATB system back, which has not been featured since Final Fantasy IX in the PlayStation 1! (I think XIII used a similar system though? I am not too sure since I barely played it, but by this I mean carbon copy the 4-9 system with no changes)

In fact, I wonder if a new Final Fantasy IX (where it is a "return to form" in a way) would be a good way for the series, though that definitely overlaps too much with Bravely Default. Maybe bring back the steampunk aesthetic of VI or something instead.

Final Fantasy XV. SE tried pandering to the Western Audience starting with 13 and its sequels and 15 took it to another level.

Announced originally in 2006. It took them well over 10 years to make it and still turned out mediocre, 7 years to move on from the origional FF13. And imo it went even worse with the push to higher fidelity hardware and ARPG. Where they had to split the games over multiple years to finish the story. It wouldn't have taken them this long if they a) stuck to what they were good at - turn based combat b) stopped concentrating too much on graphics and put more into the story. I feel they they haven't learned much since the catastrophic failure that was Final Fantasy: Spirits Within.

Final Fantasy VII is going in the same path though it is better its still fragmented into smaller games. I miss multiple quality Final Fantasy mainline games in one generation. Something they won't go back to, unfortunately.

Realistically yeah, I can't see them doing a game in 2 years of less now. However they do now have experience in game development using Unreal Engine and can use a lot of assets in the future games so I suspect we'll be seeing more FF16 sooner rather than later. But yeah I still would settle for a new mainline FF game every 5 years, instead of 10 spread out into episodes xP

There has not been a Final Fantasy game with a "pure" turn-based battle system since Final Fantasy X in 2001. In fact, an even better thing could be to bring the good old ATB system back, which has not been featured since Final Fantasy IX in the PlayStation 1! (I think XIII used a similar system though? I am not too sure since I barely played it, but by this I mean carbon copy the 4-9 system with no changes)

In fact, I wonder if a new Final Fantasy IX (where it is a "return to form" in a way) would be a good way for the series, though that definitely overlaps too much with Bravely Default. Maybe bring back the steampunk aesthetic of VI or something instead.