Anecdotally I see the same.

One of the developers at a client uses Ubuntu desktop (I use macOS). The issues at her end with voip calls have been crazy. We've been through Skype, Discord and now Slack. Nothing has been reliable.

Edit, because I'm sick of "i can save the reputation of Linux" responses:

Its never a network issue its never even a protocol issue. Its a "application detects no input from microphone" issue.

So please stop telling me how its everything except a shitty desktop experience.