Just to chip in... GM is also moving to quarterly disclosures and many car companies who do monthly e.g. do it on a high level, all or several model lines combined which blurs the picture when they have 57+ models. Every time i was trying to pull some official statistics on German premium sales from their ERs I found things were blended within product families, or only global vs regional etc. So every automaker tries to selectively provide the information.
Having said that, the reason why I am sort of disagreeing with Tesla`s decision to avoid monthly disclosures is because this is effectively a communications problem and an asymmetric war. Whoever has an agenda to skew info against you and put things in a bad light will find the way anyway. A key concept in communications is controlling the narrative. By not disclosing the monthly numbers they are not preventing anyone from writing stupid headlines about how their sales have tanked. News sites will find other, less reliable, or even biased sources like the Bloomberg tracker, the InsideEVs estimate or even our own EU data collection and will spin it any way they want to. By not putting out official numbers and using that release to explain them, Tesla is completely surrendering control over the narrative to its adversaries and clickbait headline factories who`d sell their mother for a thousand extra clicks.