On Thursday 11 April 2019 21.17:42 andre_debian@... wrote:
> Hello,
>
> I often upgrade my Debian-Stretch.
>
> Eeach time, it's mostly packages trinity who are upgraded,
> it's good, and less Debian packages.
>
> But, is it normal ?
>
> Regards,
>
> Andr�

I'd say Stretch is "stable", and soon to become "old-stable", so I guess not 
much is upgraded.

Anyway I think this "upgrade/update" craze is mostly the result from 
Microsoft, Apple and Google having to frequently patch their buggy OSes and 
using this to force users to adopt their latest control options. Now it's 
become a fashion.

I have here a few installs with fairly old Linux versions and never got a 
problem - I agree I'm certainly not a prime taget for hackers...

Thierry