I worked at an independent VW shop in the 60s and changed many a VW clutch. Also, if the VW owner would spring for the extra $s, we would install a Porsche disk in the VW rendering the clutch almost industructible. BTW, I never observed worn clutch or transaxle input splines in all the clutches I replaced.
Also, I used to race with a fellow tech to see who could get the VW engine out and on the floor the fastest.........he won...14 minutes. A clutch disk swap was under an hour.