Who cares? a) their logs have 30% of information that is completely useless, maybe they should fix that then b) (especially) if you have a P1/P2 AD license this is just not acceptable, you are paying enough to at least have some decent storage for such critical piece of information

funny thing - if you have these things in default and someone deletes a user, you won't know who did such action after 30 days (meaning you not only can not recover the user, but also will not know who performed the action)

edit -as for the compliance, personally not aware of it, but you should be able to at least have a retention policy option for it and since most companies will just put it into a storage account or log analytics I don't think it's a matter of that