Lots of knobs might cause more repair chance

Pre-amplifier like Accuphase, they have many functions and according to the opinion of my hi-fi friend, he said, the more knobs on the equip. , there will be more chance of repair.......... Is it true?  I am thinking about purchase of Accuphase C-290 which is around 22 years old from it's launched date, do you think it is still a good gear for using such kind of old hi-fi?