Nobody seems to object to an ELT in a hangar transmitting on 121.5
Oh I wouldn't bet on it.....
why would they object to a practice PAN?
My personal objection is that it increases the risk of a PLOC, and nowadays that can be a non-trivial event. Certainly if you're heading towards the UK on a sunny Saturday/Sunday afternoon all is normally quiet on 121.5 until the practice pans start becoming audible well before the London FIR...Give in to the temptation to lower the volume on box 3/R just a bit to hear what Rhine or Maastrict are saying, and bingo, in the event of a blown handover you're quickly looking at a PLOC.
I think perhaps a more appropriate question in this day and age is how the rest of the world's GA traffic manages to cope without having the practice pan facility...?