Depends on what common means... Unlocking every Tech craft would require about 6 * (7 * (5*5 + 8*10 + 10*15))) = 10710 T-atk Fragments. There are definitely players out there who have done that, but you're most likely to find people who have 1 or 2 elements fully unlocked and the other elements at rank 2. (I have full Fire, Ice and Light, working on Lightning now)
-=EDIT=-
I forgot that there is also additional grinding required as Altiea posted to get rank 3 for some techs. But at the same time you have the daily crafts too that help a bit.
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