I see too many peep’s get stuck trying to match everything, that’s also cool but often I try to use what I have on hand or only some components from a group rather than the whole ensemble. The whole groupset concept is also only relatively new and back in the day most manufacturers concentrated on the one thing they did best.
^ It’s a shame these days bike components are increasingly designed so they don’t allow interchangability. Especially as the tolerances are getting smaller and smaller. A classic recent example is Shimano’s move to Dynasys 10-speed MTB- why couldn’t they just make it all compatible with existing 10-speed road stuff?? Another stupid one is the Mavic wheel-tyre clincher ‘system’ which is only designed to work together… come on!
Is the interchangebility due to the fact the parts are Shimano…I found trying to match different Campag 8 speed parts together was difficult. The shifters did not want to work with the derailleurs at all