Good point
So... should I create a new wallet and back up the seed on a piece of paper?
Still, a person would require my pin code to do transactions, isn't it?
Since your 12 word seed has been online (on your computer), then I would say yes. I suggest you make another and write it down and put it into a safe.
The pin only blocks a person from getting into the app on that phone.
So, if I knew your seed, I could then restore on my phone. The PIN is bypassed at that point.
Special note: The iOS version doesn't even have a pin. So, those users are even less secure.