I feel like this hinges on the fallacy that WotC must give a blatant explicit rule for everything.

They don't NEED to say họ many times you can jump in a turn because it's a dumb question. The same reason they don't say how many time you can chew during a turn.

The designers have long been of the opinion that plain language is the method of 5e, they're not making calls on things unless it adds to the experience. Nobody in their right mind would say "Well, I can jump thirty times a round" because that's just not a thing that is relevant or possible. Sure, NOW it seems relevant because people want to exploit something.

WotC also doesn't have rules on how I can make my character vomit, therefore I should be able to be vomiting every second.

Basically, most "WOW THIS IS SO BROKEN AND WOTC IGNORED IT! CRINGE!" comes down to weirdos giving the most uncharitable readings of a rule that they can so that they can exploit it and have a gotcha.

5e was designed for common sense rules, read all rules with the lens of common sense.