Do you leave your platter spinning while switching

Not unless you want to...

No. Seems like a bad idea to me, even if your table does not use a clamp or a ring. I'd never do it.

Wouldn't Delrin, Cork, Copper and Acrylic platters subject the LP to scratches if not plucked perfectly from the platter??? Seems like a good way to ruin many LPs unless you have the reflexes of a cat, Meow!

No way I would leave it spinning.

My main rig uses a threaded clamp so it's not even an option. Even if it were I wouldn't do it. There's a $5K cartridge hanging there and its cantilever is well placed to get whacked. The miniscule wear and tear on motor and belt from startups could hardly compare with the cost of one little accident...

Even on my old TTs with no clamp and cheap MMs I never did it. Why risk LP or cartridge damage? Unless you're a DJ spinning and mixing live it's a pointless risk.

Startup stress on the motor and belt can be mitigated in safer ways. Just give the platter a helping push.