Halo did actually have 510 threaded systems named Element - within my year of vaping they eliminated all of their 510 devices and changed to strictly 808.
Halo, Smokeless Image, and V4L offer systems in 808 as they cater to the "new" and inexperienced vapor. All of their systems work together seamlessly so the new vapor doesn't get confused by "ohms" - "voltage" - "watts" and all the other terms that more knowledgeable vapors learn about during their voyage.
All of the above mentioned have ventured into the "VV" offerings to make the journey more appealing to the masses. I have nothing but good things to say for these companies because for the new and inexperienced vapors it makes the journey less confusing and hopefully something they will continue to do as a healthier alternative. (One in particular for me, anyways, has some of the most amazing juices!)
Some veteran members here still exclusively use 808 threaded devices and the market for other vendors to supply 808 devices has improved tremendously over the past year.
They could easily use 510 instead of 808 and still cater to new vapers
Sent from my SPH-L710 using Tapatalk 4