I agree, they really went above and beyond with their implementation of splicing into the channel management protocol. It's a testament to how serious they are about providing a high-quality service for their users.
https://twitter.com/PhoenixWallet/status/1678781368309018624?t=EnuDyaYbOarwKYsIjQBvWQ&s=19
Phoenix wallet implements splicing in to the channel management. I know it's twitter but read it.
Fantastic work from those guys.
Discussion
I'm not a hater of custodial solutions for small amounts etc... but the reason to use them dry up quickly if their beta can deliver as promised on this.