The UA favored foe did something the Tasha's version doesn't: the Tasha's version has no utility. Hunter's Mark can be used on a target who you want to track, so it supports the danger's core schtick of being a Hunter.
Hunter's Mark should have always been a class ability. The Ranger could have been built on the Rogue chassis to allow for a bit more bonus damage too.
Nah.
Rangers are expected to be able to "tank" in a pinch or build into being a upfront warrior if desired.
D&D Rogues don't upfront fight anything that is a threat.
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Frankly WOTC had over 15 years of action RPGs to steal a mechanic for Ranger combat and stack some noncombat exploration aspects on what they copied.
How the Paladin has Divine Smite and a couple Smite spells in the PHB but the Ranger only has one Mark spell and is getting a Mark class feature 5 years later with almost no unique exploration spells is baffling.
At a certain point the "We empower your DM to invent things" mentality becomes a display of lack of imagination or a flood of apathy.
How many spells is Tasha's giving Ranger? How many are unique? I'd be shocked to see more than 10 and 2 respectively.