there is a weight aspect here, an agressive tune becomes even more agressive with weight. and a ski aspect, for a superstiff FIS ski it works out, but heavy skier + not superstiff ski and full tune no detune I find I dont like that on alot of skis, talking 0.5/3 no detune.
now add snow aspect, hard to icy conditions? usually again great, but super packed powder with lots and lots of grip some of the softer turnier skies tends to wanna really dig in when your trying to chill and hit their shortest radius, now add my 242lbs + gear and I can bend skis, and they wanna go even shorter.
on a FIS SL this doesnt really happen the same way, its more in tune, with its tune, and of course way stiffer.
I will tend to agree that a person who skis aggressive tune, no detune all day and does it will is probably a better skier, but there are other factors at play here, especially for the style of skiiing you want to do. I find I like an 88 on a lot of skis better than 87, but some of course demand that 87.
For demoing skis or new skis in general tune plays such a massive role, but for me also snowconditions vs tune, good snow can mask a bad tune.
thats my preferences...
now to my gf, she wants 0.5 or 0.75 base on everything, and 87 degrees edge angle, NO detune, just remove burrs.
Mix in a new ski with a less than perfect base and its interesting on hard surfaces to say the least, but fairly quick do discover at least.
Her favorite daily is a stöckli fis sl 155... but does not like the 157 length skis.
You've reach some conclusions for your own preferences, but I wonder if you actually reached these conclusions on skis with a verified set of edge bevels. If the skis haven't been hand-tuned by someone that has knowledge of ensuring consistent base bevels through the upturns at the tips and tails, then the conclusion that "skis need to be detuned" would be polluted by this "uncontrolled variable".
There's a small required investment for anyone interested in checking their own skis. By the Toko WC base bevel guide and the narrower DMT diamond stone that fits into it. Use a thick black marker to "paint" the base edges at the tips and tails and then take the DMT stone over those sections using the guide. If you're easily able to remove the marker in the first pass or two, then you'll know that your base bevels at the tips and tails aren't actually beveled at all. You don't need a ski bench or a vise to do this check. You can just put the ski on the floor base up and put your knee on it to stabilize it.