if they listened they wouldn't have brought back JJ and palpatine to begin with
so tired of that "whiny fanboy" narrative
the answer to OP's question is quite simple. no plan. period. it's only 3 freaking movies. feige's down the hall cranking out 20+ movies in a decade to build to something, and these clowns couldn't plan out THREE movies in half the time. there is literally no excuse. it's a classic trilogy format, it's not rocket science. but apparently it is
and with no plan, you have no coordination. and with no coordination you have people on different pages...trevorrow needs luke alive. but rian doesn't care about any of jj's mystery boxes and kills luke. but jj doesn't care about anything because he's just the fire and forget setup guy, until suddenly he has to come back and take over for colin, fix rian's mistakes and answer his own mystery boxes that were ignored by rian. and collectively it was about introducing a new generation to new heroes but nothing was earned, there was no emotional connection, and character development. some characters like finn actually regressed. hell poe regressed too, that's TWO of your new leads!
not to mention you have the OT actors and you don't have any of them in the same scene, han/luke never meet, luke's reaction to han gets cut because of course it would, and even poor chewie gets the shaft in TFA with leia. that last example is a perfect microcosm of how much "care" and "respect" went into the ST. how does that get by multiple people in the editing room, and first/2nd cuts? the audience knew that right away. amateur hour.
honestly if it wasn't for favreau doing it as a fan on a spec(!) pitch, their track record would be completely junk