How would you rate pro tools midi capability

Curious how your friends handle ongoing composer changes ( from Director feedback ) handoff from composer studio to the post house pro tools environment sound designers /post final mix process , currently, I just send new and or revised wav files with track name and they drop this in ( this method worked fine with C5 sound personnel in New York ) but If I am in a pro tools environment and I make changes to the score ( audio tracks ) , is the entire project file sent ? If yes, wouldn’t that not sync as I dont have the post mix, other post changes they are making…clearly I have no PT experience to date so bear with me - lol