It is. I'm not a fan of Drew Devault, but I can agree with this article of his:
https://drewdevault.com/2021/12/28/Dont-use-Discord-for-FOSS...
The most salient part:
> Using Discord partitions your community on either side of a walled garden, with one side that’s willing to use the proprietary Discord client, and one side that isn’t. It sets up users who are passionate about free software — i.e. your most passionate contributors or potential contributors — as second-class citizens.
Wouldn't any platform have the same problem though? A forum would partition the community between those willing to make an account and submit private information and those who aren't. It seems like no matter what platform you choose there will always be those who are willing to participate and those who are not.