I'd have to second that... I still do most of my modeling in Wings, although I'm trying to learn to do more in Carrara. Thing is, having multiple tool sets can make your modeling life simpler, as long as you can live with the exporting and importing.

I did a spline loft the other day (vey easy to do in Carrara, impossible in Wings), then exported to OBJ, imported into Wings, did some things there that Carrara may be able to do but that I haven't figured out yet, then moved it all back to Carrara for texturing.

I think this falls into the "whatever gets the job done is good" category.