Missing Signature and info about the system used

Still a lot of posts don’t have a signature which informs about the System used. Or is there a secret hidden place I don’t know?
For me that just means, “ignore”. It does not make sense to me to answer of even start to think about it, when I don’t know is
the writer working on a Mac with OSX, or a Windows on a PC.
But in fact I really don’t care if someone adds a signature or not. But those without a signature should think about it and
that there would be more answers when the reader knows this happens on a Mac or a PC.