Honestly that's my main problem with the manga. It skips over a lot of things and downplays some characters harshly. Hit felt like a complete joke, the Magetta fight was nothing compared to the anime, and so far Black Zamasu feels like a complete non-threat from the moment Vegeta went Blue (even before Blue he was already dominating the fight). But as far as skipping and making things shorter goes, they do have their reasons for it.
I'm not going to pretend the anime version didn't have a bunch of inconsistencies and unexplained things, but it felt better than the manga does, for me. It's not like the Dragon Ball franchise has ever been a paragon of consistency, anyway, and I feel like the "scale" of the Trunks arc in the anime has felt a lot more "epic", for the lack of better words.
On an unrelated note, I am so hoping Whis trains the entire 10-man team for the tournament. Sure, no one except Gohan (and maybe Buu and Piccolo) will reach the heights of power Goku and Vegeta have, but it'd be great to have them become something more.
Also, I think people are underestimating the impact 17 and 18 can have. They're not the strongest, but they never get tired either, if my memory doesn't fail me. That's gotta be a valuable asset.