There's absolutely no reason to use it outside of a tailored heavy attack build that would only yellow crit, but even then why do that when instead you could just run a tier 6 red crit heavy attack build,
A yellow crit hitting twice is like a minutely better orange crit as it has more procs, but honestly it's still just dumb
Not to mention arcane exposure is ludicrously powerful for smacking a stupid amount of damage onto a weapon as it's basically primed fever strike and a 90 electric put together,
Id say it's good for new players who don't have all the bells and whistles as a bandaid but the darn thing is so rare and expensive that it's not even good for that