The decimal point is there for people like me, who vape at <10w. Yes, at very low wattage, there really is a big difference between 9.4w and 9.6w. More flavor at 9.6w, but the wick has to be well-broken-in... but less vapor, and hence less asthma problems, at 9.4w. A brand-new wick, after a dry-burn, starts at 9.2w, and gradually goes up... by .1w increments. But I rarely ever go over 9.6w anymore.
I have 4 original Coolfire4's, and 2 TC-75w-18650 Coolfire4's... and they will only adjust in .5w increments... so on days when I'm fine with 9.5w, I use those. The rest of the time, I prefer my Minibooks, my iPV Minis, and sometimes my Sx Mini M class, because I can adjust those at .1w increments.
Andria