This is the problem… you are complaining about the dealers lack of knowledge but you clearly don’t know yourself, and you don’t know what condition of wear your clutch is at.
The dealer just want to change a lump of clutch pack and that’s that at what 300 quid plus parts and all the kit to do it.
I am saying at this stage you don’t need to disassemble the clutch you can see how much wear it has by measuring without removing anything.
That’s why it’s easy to do and do regularly…., if you know, or just put up with the dealer pulling your pants down!