Matrix (Element or other clients) seems to be the most popular one.
testman
I think that the insistance on headphone jack has gone too far.
There are now enough wired USB-C headphones and wireless earbuds available.
Yes, there are edge cases, like people who work in audio industry where most equipment uses jack as standard connector, or car aux ports, etc.
But when it comes to most casual listening, there are enough solutions.
When migrating to the new phone I tried with USB-C to 3.5 adapter. It did not work most of the time. I suspect that the issue was in my somewhat defective headphones, which have damaged wire and therefore unreliable connection.
Previous phone and other devices were probably able to mitigate the occasional "disconnect", while the adapter completely dropped connection.
But then I bought USB-C headphones, which work fine.
Supposedly Google would have better time taking care of just one consumer OS instead of two, so Android is getting some PC features so that it will be able to replace ChromeOS in the future.