But EASA applies to Europe only and as the OP has said that he's Australian, none of this will matter to him.
Not directly, but it absolutely matters to vendors, and thus to everyone who buys their products. As far as possible vendors are going to have to comply with regulations globally scale in a single model, otherwise they lose economies of scale - regional config tweaks in firmware are one thing and probably unavoidable, physical manufacturing differences are much more important to avoid.
Fact is that DJI (and Autel, etc.) *will* have to update almost all of their current models to be compliant with the new EASA regs in 2021, plus whatever the FAA eventually decides to implement for the US (which is probably another reason for any push-back on launch dates). As stands, there are probably a good deal of commercial drone operations in the EU that will not be able to operate with aircraft in the Legacy class, and DJI won't want them going elsewhere. OP was talking about making buying decisions, so that new models are in the pipe and any possible factors relating to when they might ship are absolutely relevant to that.