Yes, I think Phoenix is great leap in making the UX of Lightning better and actually non custodial for casual users. Probably the only one I would use along with Breez. But it still isn't very private and not as trustless as L1 Bitcoin.
https://phoenix.acinq.co/faq#is-phoenix-trustless
https://phoenix.acinq.co/faq#how-private-are-my-payments-on-phoenix
On Twitter TDevD tweets Whirlpool capacity every so often. 18 hours ago he posted 8,242 BTC if you believe him. But not sure why he would lie about the capacity being less. If anything he would lie about it being more. And that is assuming most people run their own Dojo:
https://twitter.com/SamouraiDev/status/1676206203330867203?s=20
Says it's triple or quadruple that if you include Join Market and Wasabi. Join Market is probably the least beginner friendly, so assuming it is used the least.
https://mempool.space/lightning
If you consider ~80-90% of lightning is used custodially, you can probably rule out a lot of the above link.
You can even overshoot my estimation to be generous. Like I said it's rough indication, but can't be far off.
