I think, at the very least, the interop problem is way smaller than commonly advertised. Using @AcrossProtocol, I bridged $50k between two L2s the other day. It took 10 seconds and less than 1 in fees. (I'm not affiliated w/ them in any way) Optimally, I don't want to go to Across' frontend, I want liquidity to be even deeper, I want to have the same guarantees for long-tail tokens etc. - but it's already a pretty good experience for 98% of users