If you want to make ultra-complicated clients, I assume that's what WebAssembly is heading towards. And it doesn't limit you to a poorly evolved language that wasn't intended for ultra-complicated software in the first place, or even force you to use that poorly evolved language on a server if you need to run the same logic in both places.
You're moving the goal posts.
It was originally about build steps but now you're talking about it's design.
And your only response is to use a technology years away from being practical for most web apps?