While I am not sure this thread is about the popularity of SL bikes compared to FF bikes (30:1 is possbile!), I am not sure range and weight are your strongest arguements in favour of FF bikes. I used to have a Kenevo but found it too heavy to be close enough to the acoustic mountain bike experience I was used to, when riding down the mountain. My experience of the SL design of bike was to get riders up a mountain and not have unnecessary extra weight on the way down.
My wife and I both ride Levo SLs with EXO+, Cushcore and coil shocks. They weigh close to 40 lbs. i also have a Kenevo SL with the same setup but have another wheel set with DH tires that I put on when I ride the bike parks. It weighs 44 lbs. I can ride either bike on any of the trails in my area including the Whistler Bike Park. My Kenevo FF was weighing in over 55 lbs.
You mentioned you have climbing grades of 40%+ and you use full power 100% on the DH trails (going down?). Does that mean you have to climb up the DH trails and you are going
MEGA fast on the way down

? Did you remove the speed limiter on your bike as I tend to need brakes on the way down, not a motor? We have dedicated climbing trails in our area that rarely exceed 20% grade, which is not a problem, as long as you are not in a big hurry. I may be in the minority but 3 to 4 hours, with a mixture of climbs and descents, are enough for me. Then again, I am 60!
In the end, this Forum is reaching out to people all over the world and with a diverse set of interests and values. I find it a similar microcosm of humanity that if you don't like my bike/trails/passion, you must be wrong!