After running a 10 session campaign lately, i had no characters with Broken Pattern in it. It just never came up, im also proud i didnt introduce a single thing about Chaos in there. The players were still happy so it went well imho.
I see arbitrarily limiting the PC powerlevel to be restricive and frankly detrimental. Its not like people have free time to do suuper long campaigns to get greatly powerfull, the scope should be explained at the start.
Non amberites beeing always weaker struck me as simply wrong, there are things out there in the Shadows that are more deadly than them, in the first novel Corwin sees a big monster just sitting in the freeway eating cars and he goes ''nope''. An average PC cannot always win versus other beeings, its just silly. The Elders can possibly defeat other things but if i were to bet on a power contest between an elder amberite and an elephant i woudnt bet on the amberite.