I'll upshift to 4 5 6 without a clutch "sometimes" The only bent shift fork commonly heard from is 2nd gear, And I'll make an educated guess that has more to do with clutched heavy power upshifts and the larger spread there due to neutral, than no clutch shifting. Pretty much every part of riding a motorcycle is an acquired skill. Plenty of ham hand guys have ruined trannies while using the clutch.
We box stock sprint and endurance road raced a 1982 CB900F for 25,000 miles then I sold it, to a "hot rod" street rider, it was last seen at over 50,000 miles with the engine/trans still untouched. Shifting and running just fine. Mo-sickles are pretty tough these days.
Only motorcycle trans that failed on my watch was a Norton that some SOB speed shifted on a "for sale test ride" A quiet rural evening, I heard the fatal shift in the distance. He snapped the input shaft on me. Wasn't till the next day that I suspected the damage. That big ol' clutch hangs WAY out there on a shaft in a shaft bearing on the Nortons. No other damage, just had to replace the shaft and as a precaution it's support bearing.
Not bragging but I can clutchless shift smooth enough that the passenger doesn't know the shift happened.
