Honestly, in all these years of playing 5e since it came out, there have been extremely few times in which Hex has been useful in its secondary application of lowering an ability check made a difference. Hex is a combat spell, it's obvious when it's cast, and it does not last long enough (see below) to make a difference in combat.
Moreover, it's concentration, if you're a caster, you have a better use for your concentration, and if you're martial, you will get hit often enough that you will lose your concentration anyway.
Frankly, there are many level 1 spells that are much more useful, are cast much more often, and are actually upcast, no-one in our groups has ever upcast hex. And honestly, paying a feat for that seems extravagant to me.
Of course, depending on your campaign and personal style of play, YMMV, but a ranger has Hunter's Mark by default and it does the job perfectly fine, including when it escapes and you try to find it again.