I think it more of a network and rank system. High level rangers work alone. 1st level rangers work in small groups or are given smaller areas to range.
Independent Adventurers
Though a ranger might make a living as a hunter, a guide, or a tracker, a ranger’s true calling is to defend the outskirts of civilization from the ravages of monsters and humanoid hordes that press in from the wild. In some places, rangers gather in secretive orders or join forces with druidic circles. Many rangers, though, are independent almost to a fault, knowing that, when a dragon or a band of orcs attacks, a ranger might be the first—and possibly the last—line of defense.
Only a high level ranger would think he can take an orc warband alone. They would have to call for help. Ananimal messenger only has a base range of 25/50 miles to call for help.
And you have to level 5 to do it in 5e.
Level 1* in 4e.
Level 4 in 3.5.
level 8 in AD&D 2e and earlier.
Otherwise they have to travel back to town or base by foot or mount.
So only fictional rangers are only loners if they are fully in Tier 2. That's the key thing. Low level rangers are not loners or rugged military travelers. Same how a level 1 paladin isn't the smite of vampires and pit fiends.
*level 1 4e rangers must take Ritual Caster and must make a DC 40 Nature check for a 24 distance messenger. So it's more like level 15.