I don't have to have any concern to be able to secure my device against third parties, it's just good operational discipline.

I don't do anything classified, or store something I don't want to be found out. On the other hand, equally I don't want anyone to be able to get and fiddle a device which is central to my life.

That's all.

It's not "I have nothing to hide" (which I don't actually have), but I don't want to put everything in the open.

Security is not something we shall earn, but shall have at the highest level by default.