The only one is that ur user is now not a non-priviledged users, so that a eventual virus or a trojan could access important system files and change/read/delete them.
In fact this would make a big security hole, but if this box is really standalone and does not have any dangerous files on it i see no problem with that
usermod -G sys username
is there any advantage to creating a separate audio group or registering sound to the users group?
by the way, i'm new to arch and loving it!
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