I’m aware of that, but I’m fairly certain the period’s kerning is the same whether the period is at the end of a sentence, or as part of an abbreviation. Therefore I think typeface designers tend to use a shorter spacing to be safe due to the differing use cases. I actually think roughly 1.5 spaces after a sentence is ideal length, but, yeah - we were taught to use double-spaces on typewriters since they’re monospaced.
I’d normally let this go, but since the whole post is about being pedantic imma make an exception:
I’m afraid that’s actually "hear, hear.’