I'll throw that right back at you. I have a Dell (yes a DELL) laptop running that is about the same age as your G3. It can still to this day perform every function it was purchased for in 1999.
Here is the problem though. Why should I trust a signed certificate? If I go to a website and am prompted by an un-signed certificate, I need to determine if I trust that that web site.
If I go to a web site and their certificate is signed so no prompt but I have just blindly put my trust in the web site and in the nameless CA.
Personally, I don't trust the CA's any more than I trust some random website.