Totally agree with you but the problem is.....I like to have fun on the asphalt as well and the 350 is singing at 60mph. I don't need more power because the 350 is crazy fast, just want it to be less stressed at 60-65mph and I like the engine character of low-to-mid power instead of mid-to-high for that type of riding.
So I kind of see it like the 450/500 can do 98% of what I can do on the 350, but is less strung out on short pavement stretches or twisty roads or eventually with a supermoto setup. I've also got a 200 2-stroke for enduro type riding and will never sell it, so don't need the overlap a 350 provides.
Either way I've got a 350 now and looking forward to trying a rally event!