The conventional, received wisdom that “bridge size are easier to shuffle” is, from an objective industrial design / usability standpoint, simply wrong IMHO.
It’s one of those ideas which people hear, then repeat, without actually examining the premise.
Unless you have absolutely tiny hands, having wider edges to grip and more width to flex the card for shuffling is in fact easier for amateurs.
Home game players are generally bad shufflers. A slightly larger size helps them compensate for this skill problem. (I can see where a casino dealer might for various reasons prefer bridge, depending on how big their hands are.) A smaller size requires a finer and more precise grip. Those with larger hands are going to have to squeeze inward to grip both sides.
Meanwhile the difference in weight in the cards is negligible compared other most human hand strength. The cards are partially sitting on the felt when you shuffle, so most of their weight is supported; you’re only manipulating a tiny portion of the card to shuffle. So unless you are shuffling for 72 hours straight, or have some sort of degenerative muscle problem, the cumulative difference should not be large enough to notice.