It was fine in the Future Trunks arc because they were still going with "Goku shouldn't use Kaioken because he messed up his body so much last time". Of course, he's been using it willy-nilly in this arc, but I don't think they've treated him as equal with Vegeta for a while. Everyone has been singling Goku out as Universe 7's ace and targeting him.
It'll be surprising if Hatchiyak: The Squeakquel actually eliminates more than one person.
If I'm not mistaken, the current standings against Universe 7 are one elimination from 6, a mutual elimination from 2, one drop-out, and an elimination from 4. No universe has gotten two KO's on Universe 7 unless you attribute Roshi's elimination to Frost.
You cannot firmly grasp the true form of Squidward's technique!And then that just stops being a thing he has to worry about.
Same thing happened with the Vanilla Kaioken back in Z as well. King Kai kept pleading with Goku not to push it past x3 or whathaveyou, but Goku kept upping the ante.
The only time his body really showed repercussions from overusing it was in his fight against Vegeta.
Well, after that, all his high intensity gravity training let him use it up to 10 with no problems. When he had to go to 20 against Frieza and that didn't work he was basically in the same position he was against Vegeta. And then he just stopped using hit because he had something blatantly better to use.

Wow, who would have thought that Hatchiyack: Nocturne Featuring Dante from the Devil May Cry series would have been this effective?
Also Vegeta won't get Ultra Instinct. Goku will get another power-up and then Vegeta will get that.
edited 21st Dec '17 9:08:27 AM by LordVatek
This song needs more love.