They're also the kinds of people who will use the same version of their tools long after they've stopped being supported, and then when you need one of those new features, or run into a problem that you can't work around, you have to drag all that stuff into the present, which is always a huge pain in the ass. And the kind of developers who got you in that situation in the first place will be the least well-suited to help get you out.

Regardless, I don't think "I don't want knowledgeable people because they might write something 'too clever' that causes problems in the future" is a particularly winning strategy. You're basically saying you want dumb people because they will never try to be too smart for their own good.