Births: I only have three type Birth source records - GRO Birth Index, one Irish birth in their index and one actual birth certificate (just realised I haven't sources scanned and recorded for immediate family where I have the paper certs - d'oh!). Citations: Census to check. Deaths - I'd still want to check; Marriages (derived from age) - to check; Misc (one family bible fly leaf) - I'd want to check to find where registered. Baptisms need to be looked at as it's 50:50 whether the have birth date.
Marriages: Marriage type sources are two kinds: marriage index or an actual marriage - neither need checking. I have two military service citations which reference the marriage date and two newspaper articles. I did wonder if AS would add a citation for the 1911 census where you have years married - but apparently not.
Deaths: None of the source type Death need checking, they are either GRO or actual death records (from AS). There's various other citations (types Gravestone, Marriage (father deceased), Military, Probate) where I'd want to look for the GRO if not also present.
I think what would work, is where Enter GRO Index Source Type text is entered, a tick box to say Ignore all other source types. Does that make sense?
Basically, what I am aiming for is that every individual has (where relevant) sources of type Birth, Marriage and Death with a dates that are Qx or more precise.