A short jump of 3ft (that's what a 10str character could jump) may be even not worth using or even animating either.
That's a good point.
In the gameplay video, we can also see that characters can climb nearly everything. The level design could easily play with verticality only with climbing and not through ridiculous jumps.
I'm still not talking about specific spells or abilities because that's the rules but all characters basicaly able to jump higher than their own size really look ridiculous, tadpole or not.
This is also another opportunity to custom characters.
If all of them can climb (not everywhere) and a few of them can jump like super heroes because of spells/race skills/... The game become deeper and your characters have "unique" exploration abilities as it is in D&D.
Joking a side, yes it looks awkward and is potentially very convenient. Whenever I buy into it, depends from whenever it is any fun. A lame explanation can be good enough, if gameplay is engaging and would be worse otherwise. I still think the jump looks silly though. I think just removing "charge up" (the pose that starts when you pick the ability) would do it for me.
I don't find it very engaging when we can jump to disengage an ennemy or when we need to jump from a platform to another to reach another one or when someone can cross 11m without any abilities.
And as you and Irenicus said... What about the tadpole excuse after act 1 ?
I guess jumping "with the basic jump skill" everywhere at every corner is not a huge part of a D&D campaign and BG3 is a D&D game, not a DoS with crododiles that teleport and cast spells...