doctorbadwolf
Heretic of The Seventh Circle
Not really. It requires your concentration, and can only be used once per turn. HM cost a spell slot and a bonus action. Your known spells are low, sure, but not that low with Tasha's. And the payoff for HM is much higher.That is not a fair comparison because it does not use a spell slot or a spell known. It is free, where Hunters Mark is expensive to cast and VERY expensive to have as a known spell.
I've run the numbers. You can check them by finding the last thread about exploiting FF by stacking uses of it during the same instance. HM still beats it unless it's a long fight against enemies that go down quickly, and even then, FF only catches up, it doesn't surpass HM.Using FF 5 times a day at my current level is more 1st level slots than I have total even if I did have HM. Also you do not have to use a bonus action to activate it, RAW you can even activate it on an OA.
It's more narrowly focused, but only generally better if your campaign doesn't challenge you outside of combat. You assumption that most campaigns are like yours is simply false.I don't think FF is great, but I do think it is in general better than favored enemy, which is really what it should be compared to. Not a whole lot better and not strictly better, but probably marginally better for most builds and most campaigns.
What you're proposing isn't possible RAW, but it won't break anything. You'll just burn through your FF uses very quickly.