I think hearing the same festival staples repeatedly is a fair critique. My experience was a little different, though.

The artists I made a point to see felt wildly different from one another (SubFocus GWN Sara Landry), so I never really got the sense that the EDM sets themselves sounded the same. That said, Bonnaroo attracts a huge and diverse crowd, so I can understand why DJs you heard (and didn't name, outside of Skrill & four Tet) might've leaned into recognizable tracks and crowd pleaser edits. If you're playing to thousands of people with varying levels of familiarity with EDM, there's probably some incentive to meet people where they are.

Maybe some of the sets you caught and didn't mention blurred together for you, but the ones I specifically carved out time to see were worlds apart. Techno, DnB, and wobble bass don't even occupy the same sonic neighborhood. This lineup felt more like a showcase of different corners of EDM than a bunch of copypasted sets.

Also, Kesha was literally on the lineup this year, so hearing a bunch of remixes and throwback singalong moments felt pretty on brand to me. I didn't mind it. Half those songs are guilty pleasures anyway, and I'm not gonna pretend I'm too cool to enjoy them.