1200 a year may sound insignificant to you London MIL...
However, people who practice PANS overwhelmingly fly on weekends with good weather. Those 1200 pratice PANS you talk about are very much concentrated over a few sunny weekends.
And my oh my what a clutter it produces!
Furthermore, a misdialed frequency takes a few seconds to sort out.
A practice PAN goes on and on and on in comparison!
disclaimer to keep the peace: please continue practising whatever you need to practise, on live emergency frequencies or otherwhise. That is your infrastructure, adhere to it, it may save your life. But do not immediately dismiss those who question the practice as a bunch of foreign pilots who have nothing to say.