It handles complex redlines, legal brief formatting, etc.

When you convert to pdf, it typically produces identical content streams to Word.

I just tried it out of curiosity. It doesn't exist in their web suite, when I tried to run it using their launcher it failed to install and crashed the installer.

I can't directly refute your claims, but I can say that a program that won't install can't do any of those things for me.

I don't care if my lawyer doesn't use word. I do care if they use a buggy, vibe coded that is still in Alpha. Word processing is a solved problem. Free (beer or speech) word processing is a solved problem. Word compatible free word processing is a solved problem. Don't put my case in jeopardy because you want to use untested, alpha software.