Maybe obsolete in the sense of feature to price ratio (infinite in Blender's case), but Maya is still very much used for the sole reason that entire studio pipelines are likely built around it. Years of tools programmers and artist knowledge build-up don't go away just like that. Licensing costs are a drop in the bucket compared to all the other overhead. Of course that's mainly concerning big productions, there's obviously no reason hobbyists or indies should be using anything except Blender. I will say w.r.t to sculpting specifically ZBrush is still king mostly due to how its technology is fundamentally unique in its ability to easily handle huge poly counts. Blender is still not quite there in the high-fidelity regime.

I suspect in general "big companies" and the ecosystems they operate in are the main reason adoption (and subsequent investment and development) hasn't happened. The Microsoft Office suite is a good example, since many companies likely run the full Office + Teams + Outlook stack. It all "seamlessly" (not really lol) works together, and it's attractive to sell corporate solutions like that.