^^^ Your bikes are most likely garage kept and not exposed to weather and as many heat cycles as your typical grocery-getter. Taking the plugs out frequently is probably better than leaving them in for over 100,000 miles. I would guess 99 out of a hundred plug changes done at the local garage go smoothly. Chances are every one of us will go our entire life without ever having a problem. All that being said, using anti-seize on plugs, as well as exhaust bolts, even lug nuts, and any other part exposed to severe heat and/or moisture, will virtually eliminate dis-assembly failures down the road. Of course you need to tighten everything properly. Using the proper amount on the threads ONLY is another precaution.
Having rebuilt thousands of cylinder heads over the years I've learned a lot about sealants and lubricants. Water pump bolts are possibly the worst for snapping off during dis-assembly. Now days many water pumps come with new bolts and they have Teflon already on them. It is used as a sealer but also as a "non-stick" coating. It is some very slippery stuff, and as you mentioned, if using a torque wrench you better set it lower.
To use yet another colloquialism, "better safe than sorry" is my rule. You would die laughing if you knew how many broken bolts I had to fix from Harley shops that use red Loctite on almost every bolt.
I've had the same tub of anti-seize for 40 years and it's still half full but nearly every time I'm working on a car it's out with a tiny screwdriver that gets dipped in it.
But as always, do what works for you.