If you were fortunate enough to marry a similarly earning woman then congratulations. Unfortunately - those are exceptional for this industry. At least where I am - it is rare to find a woman making $400K+/yr like I am. Even rarer that she’ll continue working after marriage - as many of the women I know who have made it that far end up giving up the gig and leave the husband to climb the rest of the career ladder to make up for the lost income.
Ultimately - your argument isn’t good. Your argument is “you should get married because getting divorced is so painful!” Why not just avoid divorce altogether?
I’ve seen enough loveless marriages. I put my fucking partner through college at an elite institution. I’m out well over $100K on that - and I didn’t even marry the woman. You don’t need to be married to support someone or to be giving.
Your marriage could end at any point. You just live naively thinking it won’t - but it can and it certainly could. There’s nothing stopping your wife from walking out the door and then filing for divorce. All that is different is that she needs to fill out a few forms or get you to pay for a lawyer - and the upside for her is immense. Hugely immense. Your earning for decades and half of your savings.