Did you confuse gzip and xz? You mention numbers from xz and then suddenly talk about gzip? These two are not related…

Hey, I didn't confuse them but I guess I should have been more specific. I've addressed 2 main points in my text. 1) In my opinion, for the vast majority of cases you don't need to be worried about comparability, as you can easily install better alternatives to gzip for platforms a lot of people use. 2) I think zstd can become a primary replacement for gzip due to its high speed of compression and good compression ratio, even when compared to such great algorithms like xz/lzma. Sacrificing some compression ratio for (de)compression speed is worth it, for me at least

zstandard at level 21 with some tweaked parameters (larger dictionaries) will give you xz/lzma compression ratios, while still being faster.