I have never heard that
vaping higher wattages is bad with SS, you can pretty much use it exactly the same way that you do kanthal, it's just that your build may be slightly different to get to the same result.
I have heard that intensely dry burning SS coils can be harmful, but we are talking, no liquid or wick in the coil, just dry burning on an ohm's reader. I have heard it may be better to use a combination of cleaning/washing and then gently PULSING coils to check for hot spots and whatnot, as dry burning SS "may" release some byproducts that are undesirable, but the jury is still out on even that one, I think.
I still clean my coils and then gently pulse them, I start with a good wash, scrub with a toothbrush, then swab away any visible gunk inside the coil with a q-tip dipped in alcohol then gently pulse. I think my coils actually get cleaner that way anyway, which is mostly why I do it, although I see no reason to elevate my risk at all. I have had 0 issues just using SS coils in regular wattage mode, though.
Best of luck,
Anna