So the question becomes,
for —anyone— born in canada in that time frame, under the same circumstances
(parents married, one a US citizen, one not, mom 19 or older when gave birth)
what were the effects of not having a US birth cert?
And for not having the Record of birth abroad recorded at the US consulate?
If the parent didn’t have it recorded the year the child was born, could they file it later, when they found out they needed it?
Effects: none unless you are fever-brained trump partisan. None of the concerns you list are relevant in any way.