It's possible that you're being intentionally set up with other players with bad internet connection, either because yours is also bad, or because no one with a bad internet connection can get past the bottom levels, and is therefore just a byproduct of this part of the game regardless of your...
I thought it was pretty clear in my post, I wanted to compare Splatoon 2 as a sequel to Nintendo's other online multiplayer franchises. It has nothing to do with Wii U vs Switch. I just choose the franchises' most recent release and listed their new features.
It might be a bit unfair to compare Splatoon to these other franchises, because Zelda has always been a black sheep, completely reworking each new installment far beyond average. It also may be more fair to strictly compare Splatoon 2 to other online multiplayer sequels, rather than single...