Re-upping my post from 1.5 years ago on "layer 3s":

https://vitalik.eth.limo/general/2022/09/17/layer_3.html

The summary is that layer 3s don't magically improve throughput even more, though they can reduce some fixed costs of batch publishing and deposits/withdrawals.

However, there are other, potentially "lighter", ways to get the same cost savings that you get from L3s.

I hope it all stops at L3, even better at L2, and we won't have to read an article like 'Why build L4 when we can optimize/refine L2?' in the future.

Yoo vitalik plzzzerz plx pl0x reply you are the OG of my life man you have changed everything for me as you probably know as well for so many others, it would be a god send to get a like from the OG boss 🔥🔥🔥 😂

I'm just happy to be trying it all out TBH