Actually I'd say it does.

The entire SO series is 1 connected timeline. Because 3 basically gives that a definitive ending, everything else needs to be worked into that. 
This actually does limit creative freedom, and I would imagine also sours potential interest in continuing to develop new games. Where will SO6 fit?

Most probably positions would be between 4 and 1, and between 5 and 3. Those have big enough gaps in the timeline where you could do something, but would that something be of importance to the greater SO narrative? Probably not. 

I'd also argue that the SO3 ending is somewhat controversial for the community. Take into account how rubbish SO4 is, and how mediocre SO5 is, there probably isn't a lot of interest from the gaming community either.

Now, I'm not saying that  SO6 won't exist. But they either need to redo 3, or create a brand new timeline. The latter is probably better idea since they can treat it like something new and fresh.

Did just check the remake of star ocean 2 and i absolutely dislike the cheaply added character anime portraits when they talk to eachother,instead of immersing me it would pull me out of the immersion so i rather play the old version.

I also never imagined Rena to look like or be a child,i imagined her to be a more stronger looking female fighter.

Star Ocean Second Evolution is a enhanced port for the PSP ported to PS4 in Japan, not a remake and yes the character design is absolutely terrible.

Thought about checking it out if it was on ps4 but those designs kill the immersion for me,guess i played the original enough on my ps1 back in the days. :)

What i also did not like about Star Ocean 5 is that they took the Star Ocean out of it,space travel,other planets?