We see with One D&D (proposed future version of D&D) that Hunter's Mark is turned into a non-concentration class feature/spell. Would hope Larian reexamines both spells (I assume Hunter's Mark is treated the same as Hex).
I think I did see someone mention Hunter’s Mark has seen the same change as Hex, but can’t find where.
If they didn’t require concentration at all (as opposed to just not between applications), I kind of feel it’s too cheap to be able to just reapply them with a bonus action, though given limited spell slots of warlocks and rangers it would actually make them less useful than now if each use took a spell.
But no biggie. I don’t think it would make a massive difference to me if the balance were tilted towards making these a bit easier to use more frequently, so wouldn’t rain on the parade of anyone who wanted that!