They demonstrated no such thing. Show me these examples, by the way. They aren't in the writeup for the ranger, at all, so far as I can tell. The strongest critters are fine at levels 3 to about 6 or 7. In that level range, you can choose a primarily scouting and advantage granting pet, or a pet that fights beside you, and the class doesn't punish either choice. It's later levels where one option becomes a trap.
What sacrosanct demonstrated was a misunderstanding of the subclass and what it's features are. 24 hp (at most) of mitigated damage isn't an actual thing when the pet can die from incidental damage from an AOE, and when almost no one that wants to play the archetype is really down for constantly replacing their subclass granted pet with an entirely new animal chosen from animals available in the area in which they're currently adventuring. What CR 1/4 beasts are you finding in dungeons, by the way? And it sure as hell isn't 24hp soaked up per long rest.
It takes 8 hours to regain the pet. There is no indication that this can be done as part of a long rest. How much time will the party let you take up regaining a pet every single adventuring day?
The idea that properly scaling HP (ie, HP scaling that doesn't decrease the pet's power over time) would make the pet equal to a full PC indicates a total lack of understanding, or refusal to admit to, what a PC has to work with. The pet has no special class features, very few proficiencies, etc. It's a wolf or whatever with some more HP. That doesn't compare at all to any PC class.
I did, however, demonstrate that your claim that it's supposed to be a scouting pet and NOT a combat companion is objectively false.