>> blender [...] supports two platforms
Windows, Mac and Linux; that's three, right? And it supported many Unix variants while their marketshare was significant. Where does your "two platforms " come from?
>> I’ve been doing this for 15 years
Most commenters here don't have 15 years of gamedev experience, but many here watched Blender turn into a tool among the leaders coming from a "very weird UI" in about that same amount of time. Why can't the same happen to Godot?
>> PC/Mac, iOS and Android outstrips the budget of even Godot.
We heard the same about GNU, GCC, Linux, Apache... look back at what happened to most closed source Unixes of the 90's. Yes, game engines are a different market but your argument is the same we heard other times.