I'm not a fan of spells as a class feature either like how Hunter's Mark is being implemented either, but I would point out that this was a suggestion among the complaints when the 2014 ranger came. Implementing those suggestions was WotC listening to the player base, who had a public playtest for feedback and this is the result.
Sometimes the majority of feedback wins out on what some of us want.
After catching up on several pages, I want to reinforce something that has been mentioned: No one is required to use Hunter's Mark over another spell at any time just because they also have the option to use Hunter's Mark. We select ever other spell we prepare because we want to use those spells too, and when the situation comes up which spells we choose to use or maintain we make a decision on which to the best of our knowledge at that time.
The impression I get from "but concentration conflict" or "but bonus action conflict" is "my ranger needs to have Hunter's Mark up all the time" so that the PC can benefit from it while people are arguing they don't want to use it. That seems incongruent to me.
If a person doesn't always want to use it, then don't. Since it's built into the class anyway use it when it's appropriate.
Spike growth the edge of the moat.
Summon Elemental and use an earth elemental to build more moats.
then capstone can steal from barbarian/monk as +4 STR, DEX and WIS
So... better than the barbarian or monk capstone why?
Personally, I'd take free casts of just Goodberry over HM, just because at least a Beastmaster / Horizon Walker could actually use that spell, instead of HM which hogs up the bonus actions their subclass demands.
I'm not convinced that transferring Hunter's Mark happens often enough to significantly impact those other options. Either let Hunter's Mark drop (there are free castings after all) or give up that one bonus action for it if it's worth keeping.
Having a decision point to evaluate which is more important in the moment isn't a bad thing. We can't always eat our cake and have it too. ;-)
If Rangers got Primal Awareness
I would argue that Commune with Nature is similar enough to cover the flavor. That comes much later but rangers can also cast it as a ritual now so there's some give and take overall.
There'd have to be people playing lv13+ for that.
Did you just completely dismiss every person who does play those levels? I'd rethink that. The game doesn't stop at 10th level. ;-)
Heck, many of the OP abilities people attribute to spellcasters being OP don't start until those levels.