I have ~1,400 pages of PMs in my inbox. I’ve learned to cope with the PM times. I have no desire to store them on my own.
I used to always delete PMs as I received them or I’m sure I’d have over 2,000 pages. Somewhere around 2016 I lost control.
It isn’t like the All button, but just an invisible delay in loading and sometimes it is much worse than other times.
I almost totally forgot about this thread. Anyways nevertheless I'm still a little curious why you'll need that much PM's except you'll probably want to store it safe for reference purpose because I can say if I was around when Satoshi was still active and I have a few PMs from him then I definitely would keep it.
Just out of curiosity does it take time to load up when you visit your message area or it only slows down when you click the view all button?
When you click the personal messages link, it takes 10-60 seconds to load the PMs. There is no message like when you click the All button.
Having full control of your personal messages is a good practice, it saves one from future policy changes - imagine waking up to an empty PM due to policy changes

The only thing I need PMs for is to protect me from the lies of others, but people will believe what they want anyway, so does it really matter? I have PMs clearing me from all sorts of false allegations. Whenever I post them it just gets buried or people claim they’re edited. PMs don’t provide any benefit even when they should, so who cares if they go missing? (Edited for the sake of peace)