There's no "opposition" because your entire argument is predicated on a straw man that you have invented in your own mind.
I just finished telling a woman how she should be careful on dating apps and always use an anonymous sim card, never give out her real number, or real contacts, to strangers.
But my country is making this impossible now too, and the reason is drug dealers using them for burner phones of course.
That's not really an argument against eSIMs. As you point out getting an anonymous real SIM is also impossible in many countries. What prevents anonymous SIMs (or eSIMs) are legal issues and is not related to the technical implementation. Potentially eSIMS could make the whole process of getting burners much easier, if it wasn't for the legal issues.