Opinion: "Custom"/"modded"/"hacked" devalues it

[Gameguy]

I would say that almost everyone who still plays old videongames has a CRT

Not necessarily. I'd say almost everyone who collects old video games would have a CRT. If someone just plays old games, there's a good chance the games would just be emulated on a modern HDTV using a modded console or a PC. If someone doesn't have room for a CRT, even a small 13" CRT, why would they still have room for original hardware and games? Unless they just collect handhelds and a TV isn't needed at all.

It comes around to the owner or buyer-do you want something that works with original parts, even knowing that eventually those parts will fail? If yes, are you okay with having a lump of useless plastic and silicon?

Restoration, preservation, and conservation are all different from alterations and modifications. There will be differences in untouched museum pieces and practical working systems, but the type of repair or restoration work still matters. But like you said, I expect eventually that all these electronics will stop working and will no longer be playable. I hope I won't have to deal with that myself but if so I'll probably be done with the hobby. For all we know eventually broadcast systems will change so old consoles won't be compatible with modern TVs or displays at all, even with modding the output. It's already difficult with the most modern displays available being 8K, just imagine an NES being upscaled to that resolution. Lightgun games already aren't compatible with modern monitors.

With restoring old radios the capacitors regularly need to be replaced. The original capacitors are usually hollowed out and the replacement is carefully fit inside so it looks like nothing was changed. Just to get it working you can just remove the old one completely, but it's not considered to be the right way to do this within the hobby. The way it's restored does matter if it holds any value.

Even with vintage cars that are extremely valuable, if they need repainting they would need to be repainted in the original colour or at least in one of the original colours offered by the dealer at the time of original manufacturing. Just picking any colour you want would affect the value.

Art (like painting and sculptures) is for looking at and contemplation. Video games are for looking at, listening to, experiencingband then contemplation (if you are so inclined), IMHO.

When paintings need restoration or conservation work, the work has to be performed in very specific ways to not negatively affect the value of the painting. Any type of modern restorative work needs to be completely reversible, the painting should be able to be brought back to original condition and have all work removed if desired.