The ducky 69 fire is actually well designed. It's a gamer keyboard anyway, so you really do NOT want greens on the mods with blues on the letters. Greens on mods would wear out and tire out your pinky too much. Especially important since you often have to spam the shift key to strafe/toggle jump, etc. VERY important in call of duty. Space bar with blues instead of greens, that also makes sense, since space is often tapped a lot, or quickly, in some games. And I would greatly prefer having any type of tactile switch on shift than a linear red, as on a Corsair K70 with MX Reds, I pressed shift on accident too much when playing COD. That has never happened on MX Browns, for example, even though the same spring/actuation force is in both.
So blues were a great idea by ducky. The alternative would be heavy linears like blacks, but then you lose key consistency..clickys on letters, linears on mods...
Also blues and greens have the same travel distance before you reach the bump, so while a full board of MX Clears would be AWESOME to have, having just clears on those mods would sort of change the cosnsistency (even if it would feel really good...like a stiffer brown where you could truly feel the tactile bump). And no, I don't think many people would like tactile greys on letters or mods...that's the stiffest spring Cherry makes and the resistance increases sharply after the bump...(you'd never bottom out on greys....)
I think ducky did a good job with the 69 hybrid. Maybe MX greens on the spacebar would be ok too, although blues do make sense. (and it's the thumb that presses space, and that's the only key the thumb ever presses anyway).