Totally agree. The big changes since Mac OS X was released have been:
Leopard (2007)
Lion (2011)
Yosemite (2014)
Big Sur (2020)
Having said that there's more in terms of new features in Monterey than say Mountain Lion or High Sierra - all the FaceTime stuff, redesigned Safari, Shortcuts and Quick Notes to name a few.
There's also still a lot of low hanging fruit for macOS such as the antiquated LaunchPad and just general window management which could be so much better, hopefully these will be addressed over the next few releases.