And now consider that developers would have to spend a multiple of their time on every little app. And they will be more buggy and insecure. And you'd often need to trust the binaries and install them.

Rust drives all of that down somewhat. Also webassembly will bring the ability to trust almost-native machine code.

Also: I said the main benefit of compiled languages is the memory overhead. If your 8gb of RAM can't handle multiple Chrome tabs, it's because of the memory overhead, not because javascript is slower. Most of the tabs aren't doing anything to the CPU most of the time.