Think of this from an engineering & production point of view. The original plan was premium RWD car first. Then offer smaller battery, then AWD with either battery. Clearly the battery option and dual motor option are separate, and can be developed in parallel.
2 years ago, they probably assumed the dual motor option would take longer to develop, because of all the code that has to get written, trials and validation, etc. How hard could it be to make a smaller battery pack, right?
Now we know a contractor screwed the pooch in pack assembly, and there has been an enormous fire drill to fix it.
If you were elon, what would you do?
They are late, so they have to prioritize production ramp of the big battery, over new battery features right? Not that they don't *want* to make the small battery, but right now that one step is holding back the whole assembly line. Gotta make the big battery production cheap, fast & reliable before adding the smaller option.
None of that delayed the AWD team though. So if they are ready first, that will be offered first. It's the best they can do, to keep the most people happy.
It's just like AWD Model S. Originally, AWD was gonna be introduced with Model X, but then the MX rear doors & seats were such a headache that the model got delayed. So the rolled out the AWD model S first.
Believe it or not, what you personally want for your Model 3 is not so important to Tesla. They have a lot of people waiting for every option, so it makes sense for them to just roll out new HW and SW as soon as it's available.
Personally, I want AWD, but I don't want to pay for the bigger battery. I'll decide when AWD becomes available if I want to wait or take what they have. (declining tax incentives might pay for the battery upgrade) But that's my problem, not Tesla's.
They have enough problems of their own to solve.