This is exhausting with web stuff. Every designer wants flat everything, not even so much as underlining links, let alone enough design to actually make it obvious what's a clickable button.

I think it's this cargo cult attempt to tap into what Apple had pre-2010 on the iPod and first iPhone. They're missing that the design leadership and attention to detail was unparalleled at Apple in that era, so they just flatten everything for a streamlined look and miss every signifier Apple put in its UIs in those days