'Tis strange, indeed. It's been that way for 15+ years now, though, tbh.
Premise of this thread -- and the searing Mills hate, in general -- is divorced from reality. I guess with Parker gone, unfounded hate had to flow somewhere and Mills was the next target.
Mills has had stretches of sub par play but he's far from being the problem. In fact, this team plays worse with Mills off the court than any other player on the team (-3.4 points per 100 possessions compared to +5.4 when he's on the court). Spurs would definitely be worse off without him ... and that's not even factoring in the intangibles he brings to the team. Sure, it's impossible to tell how much stability, leadership or corporate knowledge is really worth, but it very likely has some value.