I could be wrong of course. Maybe someone can point to actual negative aspects of the language or the community that I'm not aware of.
Honestly if you're interested in Nim, go learn it. I've definitely seen it being used for a number of project, the most used that I know of is (was) nitter[1]
I stopped using Nim because I couldn't get over how bad the documentation was. Hard to navigate, hard to find what you need if you don't already know what it's called and examples are extremely convoluted instead of showing you the basics barebones first. I thought this problem would have less of an impact the longer I used Nim but years later it's still a thorny problem.
That, and a lot of the more advanced features were just broken.
I believe the war is already over, the other side forked the language and seems to move in their own direction to create something new - https://github.com/nim-works/nimskull . That's probably for the better.
I've been around Nim communtiy around a year and I haven't seen any major conflicts break out since these people left. Nim is still actively developed and a joy to use. And even the creator of the language, deemed as dictator or asshole by some, comes off only as grumpy old man (show me an old man who isn't grumpy, duh). Who also realizes his flaws and is willing to compromise.