@SaurianDruid, The rogue (or thief) as always been about Dex and Int, it seems. Just reading on different editions as well as Neverwinter nights, though not sure about charisma - that would be a bard thing, i.e Dex + Int + Cha.
But the more abilities you requires to run your character the more generalist (and complex) it becomes, considering you only have 27 points to allocate. For Ranger class that would be Dex + Wis + Int (?), well if you run with 3 abilities, then the other 3 will suffer. Or your character becomes average.
Rogues have a lot of flexibility in what attributes they focus on. DEX is the only mandatory one (and even then STR rogues can be made if you really want to). INT can be a secondary skill to stack, but you don't need to take INT skills for your expertise. You could just double down on DEX with stealth, acrobatics, and sleight of hand or go for charisma and be a smooth talking con artist who has expertise in persuasion and deception.
Ranger, in this context, wouldn't need INT to be a major stat because it still only governs skill checks, not combat tricks. You just might not want to dump INT to an 8 if you want to get more out of your favored enemy checks. It also helps that a ranger can drop WIS pretty easily if they just don't worry about damage spells. Gehk, my Githyanki ranger, has only 12 WIS and works just fine with Longstrider and Fog. I stacked my INT to 14 with the racial bonus, so he's pretty good at Arcana checks, and have his STR, DEX, and CON high enough to still be effective in combat.
But my other ranger, this one a dwarf, has only 10 INT and took the Bounty Hunter favored enemy to get Investigation. That is still a +2 to investigation even if I didn't invest much in INT, which gives him a decent backup check if Gale rolls low on his own investigation. And it'll get better as you level up even without investing points into raising your INT because of how proficiency works. He'll never be a specialized detective but he can be a decent Watson to someone else's Holmes.
That isn't to say I think Larian's ranger is perfect though. There's a fair bit I'd change and I've been considering doing a revision write up for it for a while. But the skills you get from favored enemy are mostly ribbon features. The extra proficiencies like Heavy Armor or the cantrips are what you're really after.
The problem is just that some of the cantrips are garbage for a ranger. Like... Why would I ever use Sacred Flame? For the rare times an enemy is behind a wall? I'd rather have the Light cantrip or something useful for helping me explore crypts and evil temples where I might find the sort of foes the Sacred Stalker hunts.
