Sure, ruin the series some more.

No, the series has to go back to it's roots. Especially it needs to drop all the Anime clichés and actually build characters and the story into something interesting. Have conspiracy, have betrayal, have great characters. That is what the series needs more than all.
Adding RNG micro-transactions and time gates is a sure fire way to kill the series. Removing the large scale battles is also as destructive.

So, no, i don't want to see anything from FE:Heroes.

For me, the perfect Fire Emblem would land somewhere between Genealogy of the Holy War and Blazing Sword which, IMO, are Fire Emblem at the best.

Unfortunately (and I am well aware of this), that sort of game has a much narrower appeal to games like Heroes, Fates, and Awakening. The series is shifting further away from its strategy roots and more into RPG elements - ironically, some of the other elements that typically people like RPGs for (like storytelling and pacing) have seen a decline in more recent games.

I wouldn't mind seeing some of the advancements made in the relationship systems brought over; BUT, I want those relationships to matter, like if a father/mother/wife/husband/child is killed in battle, that it will impact the story regarding those characters. Right now the games are too circled around teams of immortal characters, and I kind of hate that about recent fire emblems.

no, skills I would want reworked. What i was referring to was the annoyance of a plan getting screwed because of it. I definitely don't want skills removed.