That video spells it out very nicely.
Super is riding off of decades-long writing problems and the writers aren't thinking in complicated terms. They aren't thinking specific numbers. You're not supposed to think "oh Kefla's power level is this many millions" they're thinking "Fusion is OP and we'll show it being OP".
They're just thinking about what might be exciting or what might be fun while following a very rough outline and… it's the best they can do with the hand they've been dealt.
Some people can look past these things, some can't. It just depends on how much these flaws matter to people. To me, as long as the general logic works, and I see the intention of the writers and I'm okay with that intention, I'm cool. As long as DB doesn't betray it's tone, I'm fine with it. I find a lot of DB's flaws very easy to ignore because the narrative itself works. The Caulifla and Kale fight went out of it's way to showcase character flaws and fighting styles and it gave a small character arc to both characters. As a story, I think it worked.
The clear intention with Caulifla and Kale and even Goten and Trunks isn't to ruin everything Goku and Vegeta have achieved, it's to show, look at these fun/cool new characters and have others besides Goku and Vegeta be relevant. There's also the fact that just because a character is strong, doesn't mean the struggles of other characters are suddenly irrelevant. In fact, it's actually a very well-intentioned storytelling move (also useful for marketing).
I really don't like the SJW label people keep throwing around, though. It's pretty clear a good portion of fans do dislike the characters for being strong women. Some of the stuff the characters get thrown at them is incredibly disgusting and something Trunks and Goten as characters don't get.