Oh, they absolutely should have pushed this back a year and let Rian finish it. Kennedy asked him before she asked Abrams, IIRC.
I also think SOMETHING happened either during production, post-production, or even both, because this movie just doesn’t make sense a lot of the time. It’s not just retconning things and moving too fast, it’s referencing plot points that didn’t happen prior to their referencing, and half the time it’s not finishing off things that they ARE setting up.
I’m also convinced Palpatine is lit and shot the way he is to cover up his mouth, because more than half of his dialog is completely obscured as he’s speaking it.
Something went really sideways on this movie and this was the best effort at making whatever it was they had left work.
Also I understand the refusal to not write Leia out between movies but that would have been preferable to what they did here. By far.