I think it has it, it's just called something else.

Yes, the "share message" feature accomplishes roughly the same in a less seamless way.

It's less "seamless", but also more flexible. The Discord reply feature only works within the same channel while you can share slack messages anywhere, including in threads by linking. Linking to discord messages works, but there's no inline preview.

Blender has been getting better and better with time. Many studios started with Maya or other commercial software have written tons of custom scripts to integrate better with their own workflows. Additionally, Maya/max/etc all are taught in schools, I haven't seen a school that teaches blender, at least. That means that there might be less onboarding time.

I am also believe that blender is the best all-around 3d software out there, but that doesn't mean it's best for the studio or cost effective to switch.