Biggest bottleneck for me in terms of Lightning: You have to pay to participate. And quite a lot, too. The UX is also ... questionable.
It's fun as a "Twitch Bits but open source and free" - but if the easiest solution is a custodial one, how different is it, really?

I still run my CLN node, I had a lot of fun with it, but I won't exactly miss it. A little while after spent my sats via Bitrefill, I lost my channel due to an LND bug force-closing the one that Fishcake had gifted me.

Ripped me straight out of the network and... yeah, that was that. Now it's just ideling.