Unless you don't consider your opponents striking to be a threat.
Rockhold's striking make his takedowns more effective.
Just like GSP's takedowns make his striking more effective.
Maia is a BJJ guy, he didn't have the takedowns and he didn't have the striking. All you had to do to defeat Maia was keep it standing, something elite wrestlers have been perfecting most of their lives. He's 25-9, so obviously most people couldn't do that.
Maia had to improve his takedowns to be effective and he did.
Also, the Munoz, a NCAA D1 National Champion..., and Weidman fights were contested at 185.
Colby, Tyron, and Usman were contested in the last year, all on short notice, and all after Maia turned 40 (colby 30, usman 31, woodley 36).