I think Big Philly (or Steebu) and I discussed the problems with mirroring Switch last year.
Now, sometimes mirroring route combos can be good; for instance, I used to mirror Smash a lot, as it gave my QB the ability to decide which way to read it, based on matchups etc etc. That is, we didn't HAVE a primary side when the play was called in.
The classic way to run Switch is actually to have two vertical routes on the front side, with the Switch side being your back side and secondary combo. Not the only (or best, IMO) way to skin that cat.