> Thr fact that Apple which could do this without significant adverse monetary impact but has chosen not to

They restrict access to most of the things listed above, giving randomised fakes where necessary. The advertising ID they do let apps access is unique to a publisher so they can't be tied together with behaviour from apps by other publishers, and it's trivially disabled/resettable by the end user (Settings > Privacy > Advertising > Limit Ad Tracking / Reset Advertising Identifier…). They improve things every year, e.g. Safari's intelligent tracking prevention.

I'm not really sure how you can arrive at the conclusion that Apple are holding back; they seem clearly committed to improving privacy as demonstrated by their continuous work in the area.