The band's setlists really confuse me. I don't think there's such thing as a "casual" fan - so when they continue to fill their sets with the same songs that they feel are their "greatest hits," it just gets repetitive when they've only had one true mainstream single: Change. That should be the only song that is played for the "casuals." I think most Deftones fans are pretty hardcore by definition, so performing obscure songs would not be lost on the audience.
They have a lot of casual fans. I once came across a woman on Instagram who said she only went to the show hoping they'd play Diamond Eyes and she was ecstatic because they did. Like...she didn't even know that they've played Diamond Eyes 100s of times, haha.
Still...of course I do wish they played rare songs and drop most of the more commonly played songs at least a little bit. When I saw them in Manchester this year they didn't play Digital Bath, and I was so shocked, because when the hell was the last time they DIDN'T play that song??? They could've dropped Diamond Eyes or Rocket Skates, Change and My Own Summer and replaced them with three or four older/rarer songs. Would some fans be disappointed? Sure. But they play those songs so often that it's like...you can catch it next time you see them.
That said, Deftones haven't really been a band to switch up their setlists drastically, and they have fallen into more of a routine, but let's be real, they switched things up very nicely for the Europe tour. Probably the only people who weren't excited by it are people who've seen the band so many times that even the rare songs aren't new to them, which isn't the band's fault, of course. With this tour with Rise Against, they've got a shorter setlist and it's almost like a festival, so it's pointless to expect rare songs on those shows. But I think they did a good job with the Europe setlist and it might not have been filled to bursting point with rarities, but they did get away from just playing greatest hits.
But also, I don't know what bands you guys listen to, but pretty much every band I listen to has the same routine with setlists. So it's definitely not just Deftones.
I seem to belong to their younger fans, but I think YSTB and Tempest are one of the best songs they've ever written 
I love YSTB but I'm not a big fan of Tempest.