If anyone needs a better analogy, take the Super NES. A lot of people don't know this, but nearly every SNES motherboard revision has a serious deficit on power filtering capacitors. In theory, it's not a big deal, so long as the SNES is always getting clean power. We don't live in a perfect world though, dirty unstable power getting in your unprotected SNES is an inevitability. There's a lot of SNES consoles still going strong, but there's also a growing number being found with CPU and PPU failures of varying natures, from broken video modes to specific CPU crashes to complete unresponsiveness.
In both cases of the SNES and older Everdrives, they are both poorly designed but do work. For how long? It often comes down to the quality of the chips being affected. Some chips die sooner than others, some are more susceptible to failure.