FWIW I’ve seen plenty of wives put their husbands first in absolutely everything and their relationships still broke down. I see far fewer men putting their wives (or indeed children) first in all things.
That's just as bad though. I'm not saying people should be putting their partners or relationships first all the time to the detriment of their kids. I'm saying there needs to be balance. Sometimes you need to put your kids first, sometimes you need to put your partner first, or even yourself.
To give you an example, DP is like you. For her, DD comes first, that's it. But that's not always a winning strategy. DP gets migraines, and a big trigger for her is not having eaten properly. When DD was little, we'd come back from somewhere, DD would be hungry and cranky, and I could see that DP was heading down the path of getting a migraine. So I'd make DP some lunch, and then make DDs. DP used to get so wound up that I was doing her food first. But to me, that's basic triage. If I make DPs lunch first, then the worst that happens is DD is cranky for an extra 10 minutes. If I make DD's first, then DP gets a migraine and everyone has a worse afternoon.
Yes, that's a small example, but its true of big stuff as well. In the house fire analogy from my last post, if I help DP rather than DD, then there's a 90% chance we all get out alive. If I go and help DD, who's a perfectly healthy adult, then DP is probably popping her clogs.
The best outcome for DD is that we all get out alive and she doesn't have to lose her mother. So I'm going to do what's needed to make that the most likely outcome.
(Whats actually most likely to happen is that we all get out fine, and then DP and DD try and send me back in to get the bloody cat, because I know exactly where in the pecking order I sit, and it's below that devil creature)
Maybe you and previous posters are right and it's a Mum thing vs a Dad thing, but I will always look for the best outcome for all of us, rather than the best outcome specifically for DD.