Birahu: Precisely! A profession skill covers a lot of niche small knowledge and stuff. Precisely the sort of thing the write-up in the PHB suggests, and Profession (soldier) is absolutely apt.
Player's Handbook pg. 37:
The questing knight, the conquering overlord, the king's champion, the elite foot soldier, the hardened mercenary, and the bandit king - all are fighters. Fighters can be stalwart defenders of those in need, cruel marauders, or gutsy adventurers. Some are among the land's best souls, willing to face death for the greater good. Others are among the worst, with no qualms about killing for private gain, or even for sport. Fighters who are not actively adventuring may be soldiers, guards, bodyguards, champions, or criminal enforcers. An adventuring fighter might call himself a warrior, a mercenary, a thug, or simply an adventurer.
Yet they have no charisma skills besides Intimidate, no criminal skills . . . a few later things "fixed" this, the Zhentarim fighter in Forgotten Realms has Diplomacy, the Thug in Core 3.5 (not PHB only, but d20srd) has Bluff, Gather Information, Knowledge (local), Sleight of Hand. Urban Skills for Cityscape allows trading Handle Animal out for Gather Information and Ride for Tumble
Raymond: I mean, I see your logic but I disagree with it for the following reason. Profession covers herbalism, midwifery, brewing (as mentioned above), gardening, and a host of other skills which certainly showed up in "barbaric" cultures. Now you could say that the focused warriors of a tribe wouldn't get these but here we're making an argument for restricting based on culture, and I'd propose that not taking ranks in the skill represents a lack of training in that skill, not that there should be a restriction to begin with. Also this doesn't explain "urban barbarians" like myself (from a rural farm but bear with me) who are normal people otherwise. My character isn't particularly skilled or cultured, but growing up on a farm and not being able TO farm well (Profession skill!) kinda informs her character backstory
This message had punctuation tweaked by the player at 14:10, Tue 28 July 2020.