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Is that only true of particular bikes? I thought the whole idea of a wet clutch was that it’s for constant use, so to avoid clutchless shifts?
pdlouche-
Nah motorbike gearboxes are different from cars. If you can unload them for a fraction of a second while you change you don't need a clutch at all. Much easier (on the road at least) to try it changing up. Just chop the throttle a fraction to unload and quickly bang it up - with a bit of practice you can make it almost seamless. Start with the higher gears, not the 1-2 shift. Doesn't hurt the box at all.
You can do the same going down but it's very tricky to unload the box the same - you'd need to have the back wheel almost off the ground on the brakes really. Big difference to off road - MX you just stamp down on the shifter, no clutch at all as there's less impact through the transmission from loose surfaces.
Jung
Clutch-less shifts probably hurt the clutch less than actually using it. Could be plates, just as likely tired clutch springs. It's easy enough to check mate - if you're really lazy (like me) you might get away with laying the bike on the side and not draining the oil to open it up and check.
By the by, if they're flat, I almost never order new steel plates - total waste of cash. Springs and friction plates almost always does the job.