I do think a lot of people overlook Noel's offensive warts a bit too much. He's a real problem there. The terrible Sixers context makes it really hard to give it too much weight, but he graded out soundly below average on RPM for instance because his offensive game is just that terrible for instance. He seems to fit the prototype of the rim protecting center, there's a case that his offensive game is so raw as to not make it worthwhile. Plus, he didn't really show much development there this year, although again, the Sixers are a really rough context in which to evaluate a guy.
I'd still love to have him, since I think he can be used much better, but I see why there's less of a market for him than one might expect. The example that comes to mind (and is consistent with Ujiri's pursuit) is Biyombo, who was a year older last year, but otherwise was another young, athletic rim protector with a really terrible offensive game. I think Noel is probably toolsier than even Biyombo, but it's telling Biyombo only got a 1 year deal for $3M. Now that looked like a great bargain even at the time, but it's a sign that the super-extreme min/maxed skillset isn't something GMs are falling over themselves to get.