I agree. There is even more possible and not all modules are really well designed (e.g. why did Dieter Doepfer feel the need to swap around the otherwise identical inputs between his SEM- and Wasp-Filter?). Other modules just don’t go far enough. many lack attunoators/attenuverters (for economical and space reasons).

You have to really fight to get a decent physical interface, to get a good one takes even more.

I believe the future of modular interface design lies especially in more visual feedback which makes usage easier and more intuitive and systems more reliable during live usage. There we can learn from modular and semimodular synths from the software side.