One of the issues with TLJ I never see discussed is the lack of any off-screen time to develop characters. TROS will finally give us that, but another thing that advances off-screen is the movement of the pieces - the growth of Anakin and the clone army from 1-2, the clone wars of 2-3, the large gap and takeover of the empire from 3-4, etc.
TLJ taking place right after TFA pretty much just resulted in one large film. This is supposed to be a trilogy, instead it feels like parts 2 and 3 are getting crammed into one movie.
And reading the plot for TROS, regardless of their legitimacy, I can't see how this film can get the job done properly. Even if it's decent, I feel like it will be held back by not being split in two. Especially considering I'm sadly getting some Harry Potter 8 vibes.