It works fine on steam deck - apart from the usual issues with controls of a shooter on a handheld
Just let it sleep. Booting up will require more and you miss out on the instant wake feature to continue where you left off. 7% is a bit excessive, maybe reinstall it fresh from a factory image to be sure.
second that. after arch, manjaro, debian and ubuntu i landed there as my daily desktop driver.
for servers, i still stick with debian, but might also go for an immutable rolling release distro next