You are not paying attention. WASM's ecosystem is moving slowly but surely in the direction of JS being thrown away for good. Ain't happening anytime soon -- sadly -- but especially with WIT used to specify various modules and collections of modules plus having more or less uniform function specification, the days of JS' monopoly are numbered. The writing is on the wall. There are successful WASM web apps not written in JS today.

JS is being tolerated. Not adored.

Frontenders are living in a bubble and don't see it.