Yes, you don't have to do these, but some people just like buddyhood kind of binding more than others.
But what you suggested was that people change their behavior regarding other coworking relationships that are otherwise working fine for both parties.
If both parties are totally comfortable with whatever dinner plans that they have with each other, then who are you to go in and tell them not to?
You suggested that men change their mentorship behavior that is otherwise working fine with their male mentees.
I may be missing your point. If you mean that two men shouldn't have to stop meeting at a bar when they're both comfortable with it, simply because there's a woman on the team who wouldn't be comfortable in the same situation, well... let's say your team has a habit of meeting at a Brazilian steakhouse to make important decisions. Then you hire Dave's brother Jerry, who is a strict ethical vegetarian. Don't you think it might be a decent idea to pick a different restaurant? Jerry swears he's willing to come along to the steakhouse and bring his own food, though you notice he looks pretty queasy and never touches his food the whole time you're there.
Or maybe you think it's fine if he quit if he's so uncomfortable, your team just isn't right for women oops I mean vegetarians and they'd be better off working somewhere else.
If you are the kind of person who does not have to social skills and awareness to navigate these kinds of normal social interactions, with other normal humans beings, then fine, silo yourself off, metaphorically with extremely impersonally relationships with others in which you act 100% "professionally" all the time with the people who you spend half of your waking life with.
But the rest of us are able to handle such situations easily.