If you don’t know what they are for, I would trust the maintainers and keep them installed.
None of them will be of use to “browse the internet”. Avahi, for example, is for finding local devices in your local network, like a printer.
As the isos are not only for installing but also Live-usb which are very often used to fix your already installed version, I would hate to install of these program/libraries again and again.