The change would bring it closer to 5e RAW, yes, but I was okay with Hex not taking up your concentration while it wasn't actively on a target, as a gameplay-transitional change. It was one of those QoL for video game changes that was fair and acceptable, in my opinion - it's still in danger of begin broken when you're actively holding the hex on a target, but in between reapplications, it's okay for it to sit in the back of your mind and not take up any extra space, for a video game. It's base-line duration is an hour, which in Larian-game terms has been expanded to functionally mean 'until you rest'; I would change that to end when you Short-rest, but otherwise I'd let keep it as it was initially, and only hold your concentration when it's active.
