He's a guy who benefits greatly by having superstar players on his team.
LeBron and Kyrie draw the shotblocker out of the paint consistently. When that happens, Thompson runs right to the rim, where he abuses opposing guards and forwards on the glass. It's no more complicated than that.
He's very good at what he's asked to do. Very solid player on a team that just needs him to rebound and play a little D. I don't think you'd like the results if he was asked to do more, though.