Knowing how to program an expression pedal makes tweaking your normally adjustable settings on your pedals available in real time (ALL simultaneously) via MIDI not requiring you to take your hands of the guitar and bend down on stage etc. Just sayin... If I only need a Tuner, Delay pedal, Chorus pedal and Compressor-- I used a small pedal board. Other projects, gigs and etc. require more (Both in terms of requiring additional sounds/fx, and real time control of the soundscape and the gear that makes it possible vs tap dancing while trying to sing as an example) I figure all gear are merely tools to suit the player's specific purposes. I know that there's a lot of guys here who have more than one rig and several with more than 2 or 3. They're tools in a tool box... Nothing more To me, the real trick is knowing what you're after in the 1st place, then obtaining, and learning how to utilize the gear to make it happen. Of course, it should go without saying that having a certain level of proficiency on one's instrument is a good idea before getting too hung up on gear snobbery, BUT-- Even then, if it makes them happy so what?.