Let’s say just like for example like MacOS. It’s awesome we have so many tools but at the same time lack of some kind of standardization can seem like nothing works and you get overwhelmed. I’m asking for people that want to support Linux or not so tech-savy people.
While I don’t disagree with you about the potential of those alternatives they won’t cut it for the average graphic designer… usually not due to the lack of features but most likely because of the network effects / dominant position that Adobe holds over their field. People who need to collaborate with others and are pressured to get stuff done can’t afford the slightest compatibility issue.