Other classes rely on their spells more for combat. Rangers rely on martial attacks as well, and those don't require concentration.
Hunter's Mark is a spell, so if you are using your class features then you are relying on spells. In that respect I think some Rangers rely on weapon attacks more than others, but in 2024 pretty much all Rangers rely on spells
extensively.
Those are there because Hunter's Mark was identified as an iconic ability for rangers and those abilities help keep that ability relevant. If Hunter's Mark had been implemented similarly as a class ability instead of a spell I think the discussions would look different just based on that paradigm shift.
I don't find HM to be an iconic Ranger spell, I don't think it was a spell at all until 5E AFAIK. Perhaps they intend to make it a class defining spell, but if so it is a bland attempt and one much of the community appears dissatisfied with.
I think spellcasting generally is a more iconic Ranger trait than HM spell specifically.
At least the ranger capstone actually improves what's been determined to be an iconic ability of the class.
HM is a spell, not an ability and the improvement is an objectively pathetic improvement on a very weak for the level spell.
A Barbarian gets +4 in two abilities and a Ranger gets +4 or so damage per round when using a spell that he will logically only be using against weak opponents when not using a more potent spell.
I think wizard players and sorcerer players would be complaining as to why rangers get an ability so useful for magic and they don't being the studies it to death guy or the naturally gifted in magic guy.
Wizard and Sorcerer class abilities are FAR, FAR more effective with spells than Ranger abilities. I don't think any Sorcerer would give up metamagic for damage not ending concentration on a 1st level spell and I don't think any Wizard would take advantage on weapon attacks while concentrating in exchange for Spell mastery.
This serves to highlight how pathetically weak these are as spell boosts compared to what other classes get/have at that level.
Implementing it that way would be and obvious buff to the class's spellcasting ability and not thematic for rangers.
Spells are thematic for Rangers and spells in general have been part of the Ranger class far longer than the Hunter's Mark spell specifically has been.
Further when talking about thematics, Hunter's Mark is not thematic at all. It is one of the most bland and flavorless spells in the game!
That falls into a vocal minority argument. We don't have those numbers. Or at least I don't.
The numbers floating around here (which may not be true) are that only 15% are happy with the new Ranger, making it the worst class in 2024 and worse even than the revised Ranger for 5E.