Why indeed!
The tuner was on the board before the Shure, and I am using the second output of the tuner to feed a clean signal to the key input of the noise gate. If I sold the tuner, I’d need to pick up a splitter box and it would cost me as much for a decent one. So the tuner stays for now.
Also, if my wireless was to fail mid gig, the Shure unit is rendered useless as it has no cable input, so having the boss means I still have a tuner and a way of muting my signal, should I need it.