So what if he has one job? Why does that actually bother you? If it doesn't apply, let it fly. He may not be qualified to join every ls, but there's tons on Asura to choose from. Perhaps SAM is his only currently geared job, while he's working on others. Maybe he's returning. Number of reasons possibly here. I didn't get the impression he was stubbornly refusing to play other jobs, so not sure why you took offense to that.
Real talk - there are literally shout groups that can clear wave 1 and most of wave 2. People do RP or clear farms
with mules and sell the extra spots. The content isn't even hard to begin with. There are mid-level LS that
could be looking for players, any players. That's why he's asking, he wants to join something. God forbid he doesn't have every support/mage/tank job leveled. Nowadays on Asura, people buy
EVERYTHING; at least he wants to join and contribute a little bit. He could just as easily bought 300m worth of gil and paid for clears. He didn't. Give the dude a break