wireless "things" are common with the abundance of tech available these days. but for mission critical applications, wired is preferred.
the reason vocals and guitars are typically wireless in big important concerts is for the entertainment value. these musicians want to walk around the stage and entertain the audience. being stuck in one place isn't as entertaining. so the techs prioritize wireless bandwidth for those instruments with systems that cost around $5000 for EACH device (mic, guitar wireless, etc.), plus paddle antennas and more gear to ensure the clearest wireless signal possible.
then there's wireless IEMs taking up additional bandwidth, and failsafe floor wedges in case of dropouts. again, the instruments and vocals are prioritized. the total cost for just the most reliable wireless systems for a typical 5 piece band could easily be $50,000, probably more. that's a LOT of money.
if pedal controllers and more were wireless, the bandwidth for the important vocals would be reduced, and problems would occur more easily.
yes it's 2020. yes, our convenience devices like keyboards, mice, phones, etc. are wireless. but dropouts happen all the time.
in a small theater show i did, our conductor who played keyboard wanted to use bluetooth for his patch changes to his macbook. i told him i have a USB-MIDI cable he could use instead. he said no, wireless is the way of the future.
within the run of 20 shows, he had major dropouts and missed patch changes about 1/2 the time. this was a very small room, he was within 5 feet of his computer, and people were asked to turn off their cell phones completely. who knows who did it, but the RF in the room was pretty minimal compared to a huge 50k outdoor concert or something. even after a few shows, he wouldn't use the hard wired connection. for our finale, we had some important people coming down. and he finally used the wired connection. no issues. flawless.
wireless is great. but has anyone counted the number of wires needed for a wireless setup? power, signal out, signal in, antennas, repeaters, etc.
i come from a professional "nothing can fail" point of view as a musician. i hardwire everything i can at a gig. for critical gigs, if i run wireless for anything, i have a wired backup setup and ready to go. for guitar, i have a cable near the gear input and the other end near me on stage to swap quickly if anything goes wrong. and things go wrong with wireless, all the time.
again, the professional wireless systems are $5k or more for each device, and they still have problems. i can't imagine sticking a $30 chip in gear to make it wireless.
fractal gear is professional gear. at this time, wireless still isn't completely reliable and in most situations is more convenience than necessity. i've been fortunate to tour several high-name professional stage setups over time. everything is hardwired as much as possible. bandwidth is reserved for the few mics and guitar packs used for entertainment value. sidemen playing on stage are hardwired. if a guitar goes out during a show - which it does - the tech runs the backup guitar and wireless that's ready to go as quickly as possible. for one band, each guitarist had 4x $5000 wireless guitar systems in each rig - 2 were the mains for switching guitars between songs, and the other 2 were the backups for those mains. that's $20,000 in wireless x3 (2 guitar, 1 bass). and they said it STILL fails more often than they'd like.
save $20k. use a $10 cable.