Napalm, they are not completely harmless, the bypass switch is another device the signal has to pass through.
I still have to hear complaints about passing the signal through the "tape/normal" switch, even though very few of us have any use for that switch these days....
Let's not split it to that extent, eh?
The BP6 is a consumer model (hint: no XLR), and having a BP6TC would not affect in any way your enjoyment of a puristic/professional BP26.
Nap.