Google docs as a consumer use case isn't bad - hopefully you have the brain to know how to get all your drive content and switch when they eventually kill Google Docs as not profitable enough.

The problem is the business use case - and this comes from the popularity in the consumer space. The collaberative features of docs/drive is even more applicable in a workplace environment, and if businesses that hire "less technically inclined" people and have to hand hold them into getting used to it, and are presented with a demand to switch, the transition overhead would be massive.

It is actually a strong business interest to use FOSS because I bet it would cost less to get a junior developer to manage a fork of an old interface / feature that was depreciated in mainline and keep the security up to date than it would cost an actually big business to switch their entire software suite away from a depreciated closed product / one that radically shifts.