What you seem to miss is how terrible most tier 6s are. The 12T doesn't need to do much to be exceptional. The other tier 6 lights have 50% more DPM than the 12T...........but fire single shots and are out DPMed by everything else.
The 12T has an 18 second downtime and a 7.5 second uptime. I don't know what game you've been playing but big alpha trading tanks have been in vogue since forever. 180/220/240 for tier 6 for example. Having a clip and gimped overall DPM is more useful than having less gimped but still poor DPM, especially on a light.
540 alpha isn't amazing but you can take out anything that isn't a TOG in two clips. And you have the pen to make it happen.
I don't know what you think the 12T is but complaining about track traverse on a tank that plays like this is...difficult to understand.
This isn't a light tank that happens to have a clip. It's the lightest possible chassis that the French could mount a TD gun on, and it shows in game.
It's not even a difficult tank to play. You max out the gun handling, always be ready to fire gold, relocate, land two clips, sometimes more. Then you're done.