This is a great post bringing awareness for those that don't know or pay close attention to how this works but I would point out that it's completely dependent on the gear their guardian is currently wearing and that you may not be able to reach a T12 set up without swapping something out.
sometimes you may not want to swap out a piece of gear because of the other perks given - my titans adamantarium for example, don't want to give up the extra grenade or heavy capacity for str because I don't need the int or dis (just an example). I could of course use glass needles until I get it where I want it, but if I get let's say some solid boots that fix this it'd be a waste.
There is the whole leveling bit too. Increasing your light takes priority and sometimes it's not worth it to infuse, infuse, infuse when you could just swap your armor for 10-20 minutes until something higher drops and infuse once it's worth it (5-10 light above what you are infusing it into).
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Yeah, good luck getting Armamentarium T12 capable. I wasted about 20 glass needless on mine, finally got it to a total of 137, but it's Int. - 25 / Disc. - 112.