The ranger you cited was played different from "standard" rangers, but was still mechanically mostly the same as every other ranger. The class abilities are the class abilities. Subclasses only vary that a little bit.
That is not true on a Ranger. Fey Wanderer dramatically changes the mechanics due to three specific subclass abilities:
1. Otherwordly Glamour: The Ranger class mechanics make for a poor "Face" character, but Otherworldly glamour dramatically changes this. With OG and a+2 Charisma and Max Wisdom, a Fey Wanderer Ranger can be the best Face in the game, even eclipsling a bard in that role. My Fey Wanderer at level 5 had a +12 Deception, +9 Persuasion, +9 Intimidation, and +6 on all other Charisma checks along with Guidance on top of that. By the time the game ended at level 16 she had +18 Deception, +18 Persuasion, +13 Intimidation and +8 on all other charisma checks ... again with guidance on top of that. This is not even as good as she could have been. If I made Charisma my #2 stat instead of Dexterity it would have been even better.
2. Beguiling Twist: This makes the Ranger a force throwing around Charms and Frightened. It works best with both another caster in the party focused on those conditions, but the Ranger can "go it alone" by picking up Cause Fear through Fey Touched. This is an extremely powerful ability if you lean into it because every time an enemy makes a save you twist it on to another. Also after the twist concentration goes away allowing you to cast another concentration spell.
3. Fey Reinforcements: This allows concentration-free summon Fey, meaning you can spam them. They also get a Bonus action charm every turn which you can use to trigger Beguiling Twist on a save against that charm. This is arguably the most OP thing I have seen in combat period because of how it dramatically changes action economy.
Add in Charm Person and Dispel Magic through your subcclass and this plays very, very different. The last Fey Wanderer I played into 16th level rarely used the attack action at all. She spent most of her turns summoning Fey or casting Cause Fear, Charm Person, Dispel Magic or an offensive Ranger spell and being a control caster. She tried Charisma checks in combat more than she used the attack action.
At 20th level a ranger has 19 abilities. Only 4 of which come from subclass. That means that around mechanically your ranger was 80% the same as every other ranger out there.
Sure but it is the abilities you use that matter in terms of how you play. All Paladins have divine
Yes she had all the class mechanics - extra attack and a fighting style (Druidic Warrior), Primal Explorerer, Nature's veil, Favored Foe etc, but She was mostly a caster by this time and did not often use those abilities (except for Nature's Veil).