Because people starting to realise ecash on bitcoin is a beautiful castle built on the sand of very shaky assumptions.

Much of the energy/resources would have been better allocated elsewhere.

Any effort to point this out was attacked, at times because of the monetary interests at play grants etc. Those who have expressed honest criticism, or even just indifference publicly @jb55, have felt sidelined as naysayers by industry as a whole, which should not happen. There have been few underhanded attacks from cashu camp against projects that invalidate ecash use case. I can see why some animosity has built, and public indifference flipped to open criticism.

If someone has nothing to gain by critising something, yet a lot to lose, it's an honest opinion that should be listened to.