I would like to make a fresh sys-whonix but I wonder if I delete sys-whonix and then make a new sys-whonix am I messing things up? Is there anything special about the sys-whonix that the system creates for me? I don’t know much about salt but is it somehow “tied” to the default sys-whonix?
If it’s just for browsing tor you should be fine with a renamed sys-whonix. Not sure about updating (try updating the policy in /etc/qubes-rpc/policy/qubes.UpdatesProxy).
Furthermore if you recreate it, your entry guard will change.
Did you try it or you assume? Because as far as I can remember I couldn’t browse with torbrowser in whonix-based dispVM recently with sys-whonix renamed.