Glad to contribute!  And to be back after a 10-yr hiatus from once being a prolific commenter.

playing ROMs of an SD card doesn’t make it emulation, because original game cartridges contain nothing but a ROM on a memory chip to begin with — except for the few cartridges that have one of Nintendo‘s several different MMC chips to expand the base system’s capabilities. Yet, all of those MMC chips have been…

Part of your argument is flawed, given that the NT and NT mini were both jailbroken (by the guy who made the system for Analogue) to play all of the following: