> EVs are now, and for several years into the future, a small part of GMs story. They are Tesla's whole story. So, yes, GM can afford to be less specific—heck, even less certain—of exactly what they are going to do in the EV market.

Not sure I understand your logic. Every business bar none likes to be seen as forward looking, future proof. The fact that GM keeps mum about their sole EV offering means they are behind Tesla, and likely others such as Nissan on this front. If they weren't I don't see why they couldn't say they'd make 500K of it by end of 2020, for example.