You're right, but wasm's goals were never to be a mainstream way to write web applications. It was designed very specifically to allow things like Photoshop, Unity, and other high-end applications to run on the Web, things that just didn't run at all, and were really important. But despite their importance, those applications are a small fraction of total websites.

Wasm succeeded at its initial goals, and has been expanding into more use cases like compiling GC languages. Perhaps some day it will be common to write websites in wasm, but personally I doubt it - JavaScript/TypeScript are excellent.