Yeah. You have a point. Taris can't be a good shipyard.
But it can be a good training ground for special forces (die or become a man of steel).
Also, Taris can provide tactical advantage in case of fullscale war actions.
Exellent forward base, to attack home planet of Empire.
Again, makes no sense, there is no support infrastructure so why exactly would such a fleet even stop by Taris? (And, the Republic doesn't go in for such Nietzschean training methods even for Special Forces, that's much more the Empire's style of things -- a soldier that may not be "the best of the best" can still be of service other than as compost).