Good to know, thanks! I have a mental disconnect between "1-1/small group chat clients" (for which Signal works perfectly for me) and "group chat clients" (for which Slack works well for work. Discord is some of the buggiest and least-usable software I've ever used, but I appear to be in the minority there). To be clear, I'm not trying to shift the goalposts here - it's very reasonable to expect Signal to be good at both, I've just never done so (which is why I didn't know about those issues, and why I only listed SMS and WhatsApp as competitors).

I definitely see that those issues would be irritating! I've never heard of Matrix, I'll give it a look - thanks!