I think the biggest thing is that it's just removing that crutch some people rely on during battles instead of playing correctly and thinking about their tactics, especially boss battles and larger encounters. You'll only have 8 potions to help you out, after that you'll need to be smart about positioning your party, what abilities you use and how you manage aggro on weaker members.
They could do better than an artificial limit.
They could restrict access to potions. You can carry as many as you find or make, but that won't be many.
They could have potions offer diminishing results. This was actually planned for DAO, but the feature was cut.
But telling that we just can't carry more than 8, even though we could carry 5 more suits of plate armour, that's absurd.
At least I hope they've removed the dynamic loot table thing where potions would only drop if you had space for them.