I totally agree with this statement, however most of these scripted jobs do not require roleplaying elements in contrast to something like a mechanic with a tow truck or taxi driver meaning it becomes a bit of a grind to get just enough income to get a vehicle let alone then engaging in roleplay such as Poker and socializing events. Yes its true you can engage in roleplay through truck driving or courier jobs which I have done, however these situations are pretty rare and the rest of the scripted job is a mindless task of travelling from A to B with a worn out E key.
Asking around in game is also a good idea and its worked for me on some occasions, as some people don't want to disclose what they do IC (understandable).
This thread isn't meant to take away from RP and make people not research on their own, I encourage that, however it's just meant to save the first 30 hours of mindless grind which could ruin a players first impressions of what roleplaying is about.