100% Crit Jhin build?

Dumb idea? Yesterday I played Jhin and I got 100% crit late game with ER, IE, PD, and Rapidfire Cannon, along with boots and GA. Since I was Jhin I had DFT, so I didn't have any sustain after I sold my Dblade.

Now obviously there is no perfect build that you take every game, you're supposed to build with your opponents in mind. I figured that because I'm Jhin and the enemy team had a lot of burst (they had a fed Orianna Mid and an AP Sion top that somehow got really powerful from behind. Also a Xin jungle. Their bot wasn't a threat) a Bloodthirster would be pretty pointless since I don't AA fast enough to keep it up and I considered Deaths Dance but was convinced that GA would be a better last buy.

Now I personally find 100% Jhin kinda weird because he already has a guaranteed crit on his 4th shot. The only real benefit I see to 100% crit is that I basically become a non jumpy Kalista (or THE FAST!) because I get a MS boost whenever I crit that scales with my built attack speed (coming from PD and Cannon).

Dumb build or OK?