They're not all like that, but let's face it, someone who gets a PPL and an FI rating as a route to the airlines isn't going to fly a tailwheel aircraft into a short grass strip (or even a longer one) or necessarily empathise with someone else who wants to, are they?
Teaches you a lot about flying though and when all the lights go out in a 200 tonne jet you still have to fly the bloody thing.
I have no experience of flying anything heavy at all, even a heavy, complex single, but in my naive little world I have to believe this is useful experience whatever you fly, and possibly essential.
QDM