True, the weight and handling of every motorcycle is different. A 1000k3 weighs 443 LBs wet while a 600k3 weighs 423 Lbs.Not opening the throttle all the way is NOTHING like having a smaller bike. A liter bike at 3-4K RPM makes more torque than a 600 does at peak. Also, the weight and handling is different.
Same thing for a car versus a motorcycle, they’re entirely different things. You have a lot more forgiveness in a car. But, learning how to ride fast on a 600 is going to be easier, because it’s more forgiving. Put-putting around the track getting lapped by 300s doesn’t mean that the 1000cc was suddenly a good idea.
I really doubt a 1000k3 is making 65 torque at 3500 rpm at full throttle but you might be right. Either way, you don't have to have the throttle full open. You can easily modulate anyone where 0 torque to max torque or anywhere in between with buttery smoothness. I cannot fathom how that concept is so hard to get over. I think maybe older guys who are used to carb'd bikes with crazy peaky power curves are still applying that logic to much smoother machines, but it just doesn't apply.
All that said, I would recommend to anyone to "start out" on a smaller bike, sure why not. But nothing wrong at all with going to a track day on your liter bike it shouldn't hold you back.
But to each their own, no problem with me if you prefer to recommend to others and for yourself to use a bike with less power at the track.
When power delivery is this smooth it doesn't matter if you have more than what you'll use that day. And I'm not putting around the track getting passed by 300s, not that it would matter. I'm not racing anyone out there.