Earlier quoted context omitted.
I'll add that this makes preservation a lot easier. For example, there's the 64DD. It's a disk drive peripheral for the N64. It's Japan-only--for various reasons. Some people thought it would be difficult to emulate. Nope, it turns out it's basically just some disk I/O. Games are just data.
Data which, with fairly simple patches, can be run from the same flashcarts you can run normal game data from!
64DD is something we would like to support fully eventually. Since the cart code is all written in C (+PIO), it opens up a lot of flexibility for implementations like this. Not everyone is well-versed in verilog/HDL, but there's plenty of C-coders out there, and iteration time is really fast (build-depoly-test cycle).