Re: As a practicing[0] guitarist ...
Some of these 'useless kludges' have been widely adopted for real benefits, as you will have seen should you have attended a gig in the last few years.
iPad sound mixing desks are now common, and allow for on-the-fly sound mixing *from amongst the audience* - that is, the sound technician is hearing what the audience is hearing. I've seen bands in pubs use this to achieve subtly that one would normally expect of a studio recording. In addition to better sound for the audience, the mixing box can be left in the stage - so no awkward run of cabling is required to a traditional mixing desk in an acoustically compromised location.
Should any musician wish, they can use an iPhone to control the volume of their own monitor speakers.
It's in the tradition of technology and music, from Bo Diddley using a solid bodied electric guitar to Hendrix having a British boffin make him up effects pedals (and upsetting Jeff Beck in the process).
I don't see many bands using this Bluetooth Fender pedal, but the wireless MIDI (over WiFi) baked into all iDevices has been used in countless gigs for over a decade - it's straightforward, for example, to control a flange effect by using any sensor (orientation, acceleration, light) on the phone.