Actually, I think it's the opposite - posters here who are Poeltl-averse, mostly have fresh in their minds the foul trouble Jakob had during the bubble, where calls were noticeably soft, but that hasn't been the case through last season. The stats posted in the previous page back it up - Poeltl isn't even in the top 50 of fouling centers in the NBA for the last two seasons. I still think he's gotta be better at avoiding fouls, though - but that's not a reason to not re-sign a player, IMO at least.
I can't think of many scenarios barring injury, where Poeltl is "overpaid" at his current contract. He's stated pretty clearly that he and the Spurs have talked about the future, and they'll probably keep him as a bench piece for this last season, then make him a starter the following 2, then re-evaluate for the next contract.