Earlier quoted context omitted.
not really, vim's visual mode always extends selection, while in Helix the base mode selects with your base commands so you can act on the selection, but it doesn't extend to the next one. For example, moving by 2 words only selects the 2nd one, not both like in Visual mode. (although in this specific case of selecting everything this difference isn't visible)
The details are different, but they're both select-then-act. Admittedly, I've never used Helix, but I don't see how what you've described is a game changer. Surely, at least sometimes, what you want to do is exactly what visual-mode provides: explicitly select a region, using the combined movement of any available operator, and then act on that region.
Surely you understand the difference between sometimes and all the other times? This is a game changer for all those other times. Otherwise helix has a similar extending selection mode like visual