WebAssembly, unlike Blazor, has nothing to do with .NET. Microsoft is merely taking advantage of a developing technology.
The major question going forward would be how bloated the relevant webassembly files generated at the end would be.
So far C#, as well as C++, are showing near native speeds.
Probably reinventing all the history and evolution of development for the computer itself - First very close to the machine and with time - further and more bloated, with the slight difference - the target platform/environment is the Web (Browser).
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