In today's
consumer market,
physical compatibility implies electrical compatibility.
This particular connector is incompatible with many 510 atomizers, and
the mode of failure is catastrophic. Therefore, in my opinion, the quasi-hybrid mod 510 connector is an inherently unsafe design.
I once had an external hard drive that had a PS/2 plug for the power supply. After moving my PC, I connected everything, and when I tried to plug in the PS/2 keyboard to the motherboard, I accidentally connected the power supply instead. Pop it went, and the motherboard was fried. Yes, it was my own fault, but I still think the design of the power supply connector was very poorly thought out.
The quasi hybrid 510 mod design is equally poor, but in this case you don't just risk ruining a few hundred dollars worth of hardware. This time around, it is a threat to the health of the user, and to other people nearby.