Okay that makes a whole lot of since! Well with the AIO being at a 0.6ohm, is that considered bad like you explained, or is it not the same thing that you're explaining?
No, you'll be OK. The design of the atomizer coils is intended to run at a total power of say, 12-30 watts.
Straight off the charging cable, you'll be just under 30 watts.
30 watts on a modern tank (coil) is almost certainly less likely to produce dry-hit conditions than using 5 volts on a 2.2 ohm atomizer from 2013 and that's not even 12 watts.
Joyetech made a really good job on these. People have reported the occasional sense of a dry hit, but I find them fabulously reliable. The thing is to not push them too high...and to never trust the writing on the side of the coil without some testing first.
Eleaf make a coil 'rated' 10-30 watts. At 30 watts it will not work properly. The vape would be so offensive nobody would puff on that for long.
Not everything in the vape world is perfect, and manufacturers tend to exaggerate. In this case, I am confident Joyetech would have tested various coils and chosen the 0.6ohm on purpose.
I use the 0.5 but back them up with temp control (SS316).... they too are quite brilliant. Far better than anything Kanger (Ni200) from last year.