I kept my maiden. And I’ve never had any “are those kids yours” issues (we did have one fairly minor ‘is that kid yours’ issue - but it was based on race at airport security, not on name - in addition to my son not having my last name, he is also Korean - he is, however, old enough to look at airport security drones and say “yeah, that’s my mother - I’m adopted - duh!”) I don’t care too much if I get addressed as Mrs. Brainiac4 - and I will use that at his work/social functions (the company Christmas party). If his distant relatives want to put that on the Christmas card, I’m not getting bent out of shape about it. Our circle of friends is small enough (and keeping your name isn’t unusual in that group) that most people keep it straight.
I did change it when I married the first time - its a pain in the ass to change your name. Then when I divorced - pain in the ass to change it again. So it is what it is.
I think your success at not changing with marriage is related to how willing you are to look at wedding invitations that come in the house addressed as if you’d changed your name and saying “oh, honey, look, a wedding invitation from your cousin Barbra” and not “this isn’t even addressed to ME!”