The main reason uBlock on Firefox works better is because of CNAME de-cloaking. All the tracking shit that appears to load as first-party, but isn't, can be correctly detected and blocked on Firefox. On Chrome it cannot, and with Google, Facebook, et al. encouraging site owners to move to these fake first-party conversion tracking solutions, your exposure to profiling has increased dramatically. You may see fewer ads but it does not do the same job.

Yeah I don’t seem to feel any performance or functionality degradation myself. What <X> ad blocking related feature has been made impossible with MV3?

Isn’t the idea that over time chrome will limit what ubo lite blocks? It will phase out all of its own ad networks so they’re not blocked first, but it’s possible they also start allowing third party ads through for a price.