Simply not true. I have been using Firefox Focus and 1Blocker on iOS for years and ads are not significantly more noticeable than on desktop Firefox with uBlock Origin. I think you quite misinformed on this subject.
It depends on your level of blocking. I use 1Blocker and uBlock Origin, and find maximum blocking with 1Blocker to be roughly equivalent in blocking to the default "Easy mode" in uBlock Origin. "Medium mode" (combined with a few additional lists, e.g. cookie nag lists) in uBlock Origin blocks dramatically more crud.
