It depends if you're using them all. Systems where I have lots of applications installed (especially graphical ones) will have lots of packages, my bare-minimum container hosts will have few. I think there's also an element of selection bias here, because people posting screenshots of neofetch on their system are also likely to be people who intentionally run very minimal systems focussed on minimizing the number of packages so they can brag about it on the internet.

TL;DR - the right number of packages to have is as many as are required for your computer to do what you need it to do, and not too many more than that.