I don't think its as ludicrous as you're making it out to be, if that were the case to discuss anything objective would be similarly ludicrous because theres always exceptions to what rule is established..
The credence here is that for the vast majority of straight men, sexual fulfilment exists only when they actively and somewhat aggressively pursue non obvious or non pursuant opportunities. But once a certain slider is maxed out in our lives, that opportunism can be practised in a much more passive manner, because said opportunites tend to much more aggressively make themselves known, if not initiating themselves.
This is an issue in same way as a child born rich, or someone bred into royalty, or any type of advantage that bumps one to the front of the opportunity line; not that they're incapable of developing a personality that pertains to healthy relationships, but rather life doesn't force them to, as say it would a less than handsome man, or a short man or any other man whose appearance, status, or personality doesn't immediately register as attractive to the women they come across...Male comedians are well known for this phenomenon, as in a lot of them aren't exactly easy on the eyes, and so they had to learn to appeal to other aspects of women's taste in order to get an opportunity with them...hence why many male comedians are either married or in relationships with women that wouldn't normally look their way twice, or are just banging conventially hot women left and right. The Notorious B.I.G literally has done entire verses and specific bars in raps highlighting how he had to learn to romance and swoon women with his words and experiences to get them attracted to him, self described as, "Black and ugly as ever, however, I stay/Gucci down to the socks"
It's not that "hot" men make bad husbands as just a blanket statement, no more than the adage about rich people and heaven compared to a camel through the eye of a needle, its that boys and men brought up in a manner where they are constantly positively reinforced by women's attraction and sexual interest independently of how they actually interact or treat these women, are probably not going to make the best partners later on.