You're right that this discussion seems circular and pointless.
IMO, it's ludicrous to move one of your best players off his preferred position, which he plays well, for a prospect who is no guarantee to earn a full-time starting position in 2023. In a computer game, sure, move them around like they're not people, but they are people. In the real world, you don't jerk your best performers around.
If Turang had 100+ ABs in the majors at the end of the year, and hit .270+, sure, then he's proven something. But he hasn't. Judging by past rookies, he has a good chance he won't be able to stick in the majors all year. And it won't hurt him (or the Brewers) to play multiple positions for a year or two.