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Taking a look at the CRB I see that using a Craft skill you can manage untrained helpers for the purposes of creating the item(s) you're working on with the skill. However that is the only "social" aspect of the skill, with the intention being that a Craft skill is focused on the end result, the thing being crafted.
Profession on the other hand is specifically called out as the skill for earning a daily wage. Sure, other skills might be marketable and Perform has an earnings component per performance, but Profession is uniquely described as the "job" skill.
So I would argue that there is a "people skills" element to Profession. Sure, if I have the Heal skill I'd know enough about anatomy to pass as a midwife, but there's no guarantee of my bedside manner. My patients don't like me and there's no guarantee I get paid either. On the flipside with Profession: Midwife I would know a little about anything to do with the birthing process, including social skills like keeping the patient calm, what alchemical substances are ok for mom and baby, and how to perform an emergency "C" section. Could I provide healing benefits afterwards? No, that's the Heal skill, but I could probably suggest a length of time average for recovery.
The point is you use Profession specifically to make a living wage. While other skills might sub in, they lack the money-making component so you're not guaranteed of getting paid. You might be a world-renowned historian (Knowledge: History with 5 ranks) but unless you took Profession: Librarian or something then you're just a blowhard or a bookworm that people find standoffish - it would take additional skills such as Diplomacy or a high charisma to make the public pay you for your vaunted skills.
Now for me personally I've also subbed Diplomacy as the catch-all selling skill. If you've got Craft: Weaponsmith and Diplomacy you can take a masterwork spear you found in a dungeon, talk up its amazing workmanship, and try to haggle out a fair to better price. That's 2 skills used though. If you had just put a single rank into Profession: Merchant you could pull off the same effect and be guaranteed at least the opportunity of a decent daily wage in the process.