@futurebird I hesitate to call them liars, because they might be honestly reporting a different experience from mine. But it *is* a different experience from mine; I find that I get *less* efficient with anything under a 60%. More importantly - for me, it's less *comfortable*.
(I made some firmware tricks in my current 66% that makes LaTeX a bit more pleasant to work with: I have layers for Greek letters and for some commonly-used mathematical symbols; both can output either my own custom Compose sequences, ibus-compatible sequences or LaTeX commands. )