Intentions is what continues to matter the most no matter which gen one may belong too. If one is a honest life partner he/she will remain, visible signs of marriage or not.
even in cultures where man n women have no visible signs of being married, go around backs as we know. 1 or 4 permitted wives, doesnt matter.
this argument of women name change doesnt go very far.. for ex kareena kapoor khan, but do her children carry her last name? no, many such women who carry their parents name dont pass it to their kids! wonder why? when the dna is 50/50 why stop last name with yourself?. So the whole thing just ends there and just seems like a adamance and nothing else.
Our hindu society has adapted such discussions in society very well, therefore we see one applying sindoor another not n yet largely no fuss.