I generally do not sub-ohm... Never really had a need or desire to.

I built the 0.8 coil to play around with in my Hana v3 DNA 30 box, and found that the minimum 15 watts I needed to run with a fresh battery was just too hot for my taste with most of my juices in the Taifun GT. When using VW devices, I'm usually in the 8-10 watt range.
I was pleasantly surprised with the results using the same 0.8 ohm build on the ProVari running only 3.0v. (11.25 watts) I'm getting great flavor, and vapor production like you would see Mark Todd blowing in his reviews.

I enjoy the consistent vape until the battery is spent, and only need to swap the 18650's used once a day.

(I'm a pretty heavy vaper

)
The issue with sub-ohming lies with the more extreme builds, and the folks who do not research what they're doing regarding using properly rated batteries, battery safety, not knowing ohms law and just wrapping coils without checking the resistance before throwing the build on a mech (also important to assure no shorts), etc... One only has to browse through posts made by new folks here on ECF and other forums to see how dangerous sub-ohming can potentially be.
Many grab the cheapest mech mod they can find, and use no fuse or short protection with the cheapest batteries they found on eBay. Funny, when I started vaping over 3 years ago, rebuildables didn't exist. Thousands of us managed to quit smoking using only standard atomizers, and cartos at higher resistances.

Low-resistance attys came on the scene for those who desired a hotter vape using mechs.
When regulated VV devices became available, many of us rid ourselves of mech mods like the plague. EDIT: I do own and enjoy a few mech mods.. (primarily for their looks, and to have "just in case") I use them with Kick 2's though..