Well since Solus targets the "desktop computing" segment, it's normal to ship it with a browser, mail client, office suite, video player, picture viewer/editor. The aim is to have something ready to use.
People can then add or remove whatever they want, but new users must have a workable environment with the most common applications ready to use.
Having a minimal/network install is of course more flexible for power/advanced users (who anyway knows how to build their customized post-install script) but it is mainly great with multi-purposes distributions and this is not the case of Solus only one architecture is supported: x86-64, not designed to work on tablets/netbooks/very old computers, not a server distro, ...
In my opinion, it is important to follow a road and innovate on the chosen path to become a reference rather than going in many directions, just following and doing many thing without being very good in any of them.