4-digit lock code

I asked this long ago in TJC already, but I’ll cast it here too.

I’d like to have possibility to shorten key/lock code to 4 digits.
That’s the way 99% of devices out there work. Why Jolla needs to force us to 5-digit key code?

Yes, there are finger prints, I’m aware and I use those on my XA2.
But there are many times one needs to input the key code anyway, i.e.;

  • phone on the table (finger print sensor is under side of the phone)
  • gloves on