I've depressed a clutch a few times and had a few dozen clutches replaced in my life - doesnt that count?
I have opinions on other things I use but did not build - like aircraft seating, camping trailers, housing complex layouts, Armed Response companies, Call Centres, Zimbabwe, the Church, the wrapping on certain consumer products, Facebook etc...
I'll change my views to positive given the "If you didn't build it - you don't know it philosophy"...