The Taureau is not a battletransport, nor was it ever supposed to be. It is a "pirate" transport, if you compare its turret number, arcs, cargo, and overall stats to the "Bullmastiff" Pirate Transport, you will notice they are very similar. It is primarily useful to shoot other transports in an offensive engagement.
That having been said all transport balance projects are currently on hold since under the current rules, there is no reason to balance them at all.
Also, this thread is about freighters. I understand posting here regarding future balance changes since the pvp balance subforum has been inexplicably locked, but please stick to the subject.
Well, you are right, it is an armored transport but the Bullmastiff can fire more turrets backward, one is not enough, smaller ships can simply shoot it from behind as it is too slow to defend itself, but fine, not discussing here, the pvp balance thread should be re-opened.