Yeah the D12 has quite a nice quality on bass, is honkyer, middier than a D112, still has an extended bass response though.
Its not my go to mic for bass by any means but it's slightly old fashioned sound can be just whats needed.
Re amping has no downside as far as I see it, you either need it, and use it, or you don't.
If you have the time, space and gear to get the sound at the time then you don't need it and you can safely forget about it. If you DON"T have time, space or the gear then as long as you have a DI you know your safe to get a bass sound later.
Reamping can be useful in that you can tailor the bass sound at the amp to fit in with an already complete track, so many bass tracks are recorded straight after the drums to guide guitars and guide keyboards, all very well but you had better have a good idea of how the guitars are going to end up sitting to get the best results! either that or give yourself lots of options in the initial tracking.
Also, re amping to augment an existing bass track (including amp) through a grittier amp like a guitar amp can be a LOT more useful than adding a plug in or pedal distortion. Phase align it with the original and mix to taste and you can have a killer bass sound.
But generally, its just another option to be used when needed, there is no downside UNLESS you have a stupid engineer who insists on interrupting a session to start re amping right when the bands in mid flow! thats a bummer.