So is it necessary for the 3 amigos to try to recreate their versions...

... of inventions or devices they are referencing just to be able to hypothesize?

For example, I didn't see any point for Grant to make his own hoverboard. Or for Tory to make his own air balloon?

Sure, it show cases their engineering skills but it was unnecessary and the show is just as good without those portions.

I dunno, it feels as filler. I'd rather they just bring in experts to talk about the subject authoritatively than watch these 3 guys half ass anything.