All good points, and thanks for making them. IMO, what this means is that standardization and serviceability are lagging behind the technology. I doubt that Fender is manufacturing the DSP itself. They buy those somewhere. Class D amps are pretty common, so it might not be unreasonable to think that someday you may be able to swap those out. Same with switching supplies. Maybe not today, but with so much technology heading in this direction, things might change and become more like the computer industry. All worth considering.