They are having some problem compiling the test suite in Chrome.
No. LZMA-based formats like xz are too slow for web transfer speeds.
Isn't LZMA decompression pretty fast? For static assets its slow compression doesn't matter.
The cost of compression isn’t nothing. A lot of Linux distros have moved off of it for packages since they heavy Zstd compression was close enough on size while saving a lot of time & CPU bandwidth.