Not to me. I would just assume they don't have E2E encryption and wouldn't base my calls around the idea of needing that. The claim is never worth it without an independent review and then thinking about the attack surface you actually want to shield against.
I mean, in another market, if you have ever investigated VPN providers you would see 100% conflicts of interest with affiliate marketing everywhere and the articles never acknowledge that the business of reselling internet access has inherent trust and unverifiable claims involved. A government can always tap the source with a legal order and there will always be information available to them.
For a video chat service, them merely saying E2E doesn't mean anything without a way to verify it, or host the whole stack myself and this is incompatible with being a company.
I've also have been using Discord for voice almost daily for a little over a year and it just works 99% of the time. Unfortunately, it suffers from "gamer" branding that makes it awkward suggesting for work. They should try offering a "business skin" that interops with discord.
It's just a means of communicating, people. Maybe a few Discord features aren't useful outside of gaming and a few Slack features aren't useful outside of the workplace. I find that to be a stupid reason not to generalize the use of these products. Skinning (and filtering away those specific features) just might be the ticket.
Mind you, I only host it at home on a VM for personal use. Have had sessions with 6 people with one of them a Europe-Australia connection. All fine on default 720p.
If I were looking for 20+ meeting software though I'd consider something else. I would consider it a case for streaming to faceless attendees. I have never had a meeting with useful input from more than 10 people.
The company my wife works for can't get a reliable Teams conference going with anyone in France.
The company lied about their encryption.
Both of these statements can be true, it's just a question of trade offs.
I know they just announced their own "Ring central video" But im weary of that for the time being.
Separately: affordable servers likely are accessible to infrastructure providers (whether a VPS, or bare metal at a colo, etc.) so it's tough to say that "my own server" is usable exclusively by me and therefore not adversarial. Plus, maybe people want to use my server and consider me adversarial for whatever reason; they should use their own server instead, but might not have the skills.
It's in here somewhere: https://jitsi.org/security/
Jokes aside, with Zoom's track record, it's not worth using anymore regardless of what features they implement. Not having E2E encryption is no where near as much of a red flag as lying about it is to me.