Most of my bags are given to me by boomers that can never remember to take their bags to the store and just buy more. I think I've only actually bought one shopping bag about 25 years ago, which is the one that had it's handle tear off after about near to two decades of service. I don't put more weight in the bag than a plastic bag would be able to carry. I have a fabric tote bag and a backpack to use for heavier stuff. I just exercise some common sense with my shopping bags, I guess.

Are you claiming that disposable plastic bags would never have the handles tear off (or the bag just split open) if you put too much weight into them? I think the same rules apply to either, it's a mess either way if you put too much weight into a single bag, so... don't do that.