I don't know, but I haven't used them once so far. They are sitting there for bad times ( only the ones, I found), but I didn't really needed them.
I don't really see this as an issue.
The issue, as I see it, is that this item -- *if utilized, as with any item* -- undermines every martial class build. It's not even like a wearable item that takes a slot on a character, causing them to miss out on some other vital piece of gear. It does, of course, mean you can't use another elixer, but that's not a significant downside.
Clearly, folks can choose not to use the potions, but I don't think that's necessarily relevant to the issue. The point is that there's an item in the game that can be used after every single long rest, which completely negates the prime stat build of every single martial class in the game.