I do not trust PER, either. But it suffices as shorthand.
Except one of the known flaws of the PER shorthand is that it is not reliable in short minutes. Wright has never played more than 19 mpg so evaluating him based on his PER is kind of worthless.
Nice framing with "never played more", seeing how he's also never played
less than 18-19 minutes a game with Dallas the last four years, either. And "19" is kind of like "$19.99" here, in that it's essentially 20 minutes. 20 minutes, a nice rounded number, does not feel like "short minutes" nearly as much, does it? Especially when it's been evenly spread across 4 seasons, about 200 games, and about 3500 total minutes. PER, if it is useful, is useful precisely to be able to measure the performance of players like Wright. So, pretty much the exact opposite of the point you tried to make.
The bottom line is that he's already 27, he's more undersized than any of our other undersized bigs, and will generally be redundant on our roster.
"Already", more nice framing. He just turned 27 this October. He'll still be 27 around the time training camp rolls around next year. He's also a young 27, in terms of career minutes, and his performance is getting better, not yet hitting a plateau.
He's not undersized in terms of height, since his vertical is about 40 inches and his wingspan is about 7'5", which...how many other players in the league have that combination? His physique could get heavier, maybe. That's what teams have a nutritionist and a gym for.
He's only redundant right now, today. Bass isn't in our plans if Rondo goes. Now we're talking Sullinger, Wright, Olynyk, Zeller. Four big men...that's frontcourt redundancy? If so, not one of the others could serve as trade bait for another pick or player? And if Wright sustains his per-minute performance full-time, he wouldn't be the most valuable?