Oh no! A bonus to passive perception actually using the existing rules that some people don't want to allow! What an abuse.
Seriously?
lol right?
It's neither an abuse, nor is it outside the rules. Heck, they're whole posit that it's somehow two checks with the observant benefit is just...completely unfounded.
RAW, the companion is fully capable of keeping watch and alerting you to danger. Therefor it can assist you in that endeavor. Doing so gives you advantage. Since Observant doesn't call it's bonus "advantage", it stacks with actual advantage.
Oh no...our ambush encounter...it's broken...
I'm sorry, but I don't agree.
Humans were probably using the reactions of wolves/dogs hanging around their camps as indicators of trouble coming before wolves were fully domesticated. "Animal helps other animal recognize threats," is one of the most common symbiotic relationships in the animal kingdom!
Seriously, I've seen theories that wolves didn't even so much get domesticated by us on purpose, like horses were, but rather hunted with us, alerted us to danger, hung around near our camps to get scraps from us, and were deeply social in a similar way to us and thus easily got comfortable with us around, and this literally just meant that the friendly helpful wolves were more successful in areas with humans around, and slowly became more friendly and helpful over generations. By the time we actually started actively trying to domesticate them, they'd gotten themselves halfway there already!
And it wasn't even weird behavior. There are areas where wolves and corvids help eachother find food and stay alert to danger. Highly social animals with similar needs just sometimes cooperate rather than directly competing. It's a whole thing.
A dog lifting its head, ears perked up, and looking beyond the firelight, and the owner asking, "What is it, boy?" is a trope as old as westerns.
This. A thousand times.
I can get that you don't like the mechanical request for some reason. But saying there's "no in-game logic" seems excessive.
Yeah RAW arguments aside...I think folks forget sometimes that dogs come from wolves, and this specific type of tasks is one of the primary reason that shift even happened.
The Ranger should be getting advantage on checks to forage food in the wilderness, track creatures, and keep the group's morale up, too!