I play / DM with three groups, all of which use Discord for voice (one also does video), and all of us started with the old Roll20 system. One of the groups did experiment with the new system, but it still had some issues, so they switched back to discord. Discord's big advantage is that they use a central server model, which for voice means one stream instead of one per player, and a lot less bandwidth, and that's a big deal for someone who's on the end of a congested appartment-building cable network with a low-quality wifi signal and is barely able to get a megabit reliably (and I have more than one player like that). For those in the gigabit world, that may seem crazy but it's still the reality for a lot of people. Heck, I'm just glad none of my players are still on DSL. Discord also generally just works, whereas roll20 on a Saturday night is sometimes less than stellar. And that matters, too. I can deal with slow dice rolls, but failing audio is unacceptable. And while I gather the new system allows some kind of multiple audio channels, discord makes that simple and painless. Something we used on a recent startup campaign, where two of us more experienced players were helping the DM manage multiple people generating new characters. We just set up some extra channels and went one-on-one with the people having problems. So, while "everybody" doesn't use discord, a lot of us do, and for good reasons. I can understand not wanting the extra complexity, and discord is a pain when it wants to download and install patches when you're trying to connect to a game, as it seems to do every saturday. But that, to me, is a small price to pay for reliable audio. I'm glad Roll20 has integrated audio. It saved me from having to learn two systems when I took my games online in 2020. And I'd recommend it to someone starting out, just to simplify their learning curve. But its repeated failures drove me nuts, and my players had no trouble adopting discord, even the tech-phobic ones, once I reduced it to a simple set of instructions (get an account, enter this url, click there, there, and there, and say "hi" to everyone). So I'm certainly never going back.