I've seen chakras proc on direct crits from bootshines, so yes they can proc on any direct crit, its still fairly low rng though. The only problem I have with chakras is in fact the rng added to the job. Monk's big catch in any raid role was being the "consistent and sustained dps" because there was never any rng involved other than getting crits, now we have this rng added to our openers, especially with brotherhood's effect (a problem being that you don't even get your own 5% damage buff) being entirely reliant on weaponskills, which overall can dramatically lower a monk's dps with a poor party composition, basically making pugging for any monk a nightmare most of the time. Brotherhood also being almost completely useless in any 4-man situation and entirely useless when solo. This makes any dummy training or parsing extremely unreliable, even for stone sky sea.