Thank you, all, for sharing your insights and interpretations. I apologize for my obvious ignorance in this matter.
My concern was that Rigol might have unwittingly allowed this model to supplant the sales of their other models sold at a higher price point, and might well want to do away with the current firmware version in future manufacture runs of the same model. Of course, the firmware could be changed aftermarket, no doubt, so I doubt that's an issue either. But I've also noted that there's a vocal minority of prospective customers who are publicly stating that they are buying Siglent scopes specifically because of Rigol's "cancellation of free features" alone. They aren't any better informed than I am, of course.