They're not, though. Good wordplay requires a great deal of wit, much more than sex or fart jokes. Puns are actually often used as the punch lines for longer-form jokes that require some rehearsal to sell to an audience.
What has happened is that, as a society, we have decided to show appreciation for puns by groaning instead of laughing, and the punster is looking for that groan when they're telling it.
I somewhat agree, good word play does require a great deal of wit. But most puns are low hanging fruit, it's probably less than 1% of puns that have some originality and novel thought about them. (A quick Google search shows that OPs puns are pretty far from original)
However, I appreciate that humour is subjective. And of course I'd expect to be downvoted for moaning about puns in a pun post.