I agree that things are relative as you move up the levels with one exception.
I think it's a given that defending and preventing goals is an easier task than scoring them. The problem is at PL and CL level attacking players are at the level where they will make you pay.
At a lower level teams will not have the quality or know how to punish you more often than not. ie they let you off.
So if you run a scheme that almost guarantees some good attacking opportunities for the opposition (regardless if your dominating) it might bite you on the arse. And if you expand that out to possibly only being allowed to lose 2-3-4 games a season to be league winners...it might not compute.
It's probably why City (pep) were so tinkled about Kane/Sonny as they would have thought 'hey we are better' but those pesky sharp shooters make us pay.
It'll be interesting to see how it plays out for sure.