There was a ton of work with CG that was never finalized due to how it looked etc. Whole segments of the movie were reworked due to effects issues etc. Rose was the least of their worries to be quite blunt with trying to get this movie out the door to Disneys approval
Therein lies exactly what I said. They knew the amount of material they had for roughly 2 years, and we're supposed to believe the actual intent was to pair Leia with Rose?
I can remember when internet dialogue focused on CGI Leia being an issue back in 2017 (also thanks to Rogue One) when people were wondering what JJ was going to do with Episode 9, so this idea that it wasn't something that J.J., Terrio, etc. could have foreseen is once again bs.