Also the 2600 is no where near HD so I don't see much benefit with high tech mod which would show no real improvement.
While you are correct, the 2600 isn't HD, you aren't 100% correct about the mods.
Quite a few people will disagree with you about it making a difference in picture quality.
As far as my 2600 goes, even with the composite mods not working very well, the picture is still better than the RF ever was. My 7800 with RF was unplayable. With one of the cheap composite mods, it has a very nice, clear picture.
I can say that my 2600 Jr remains unmodded , because it has the clearest RF signal I've ever seen. It's as good as my composite modded 7800, maybe even better. So, that proves that not all consoles NEED to be modded, but in most cases, you will notice an improvement.
I've seen plenty of before and after pics from people who have bought the UAV board and there's no denying that the picture quality goes from decent to nearly perfect.
A lot of people will say that the reason for doing a composite or S-video mod is not only to improve the picture quality, but also to give the console an output that's more acceptable for new TVs. So far, I haven't ran into a TV that cared if the console was coax or composite. I have had issues on a "Smart TV", but those issues apply no matter how the console is connected. I even tried using a VCR as a go-between. The Smart TV was still too stupid to work correctly with some games. The issues I've ran into on the Smart TV are unique. None of my other TVs had any issues at all. Even ones made by the same manufacturer during the same time. I'm getting off track here though.
As many people on the forums will tell you, most of the mods aren't "high tech" and do make a real difference. I'm not saying everyone should mod their console. If your's has acceptable picture quality, that's great. If you don't mind there being some snow, that's fine. Like I said, my Jr is still unmodded and I think the picture quality is amazing. Most mods do have some risks involved in installing them, but it's no more than the risks involved in doing any soldering, such as replacing the caps or the voltage regulator. If you do it right, the mods can even be reversed with no ill effects. I know there are purists who think that modding a vintage console is a deadly sin and they have the right to have that opinion. I don't look at it as harming the console or it's value. I want to "PLAY" the games and I'd like the best possible picture when I do it. If that means doing some soldering, then that's perfectly acceptable. Everyone is different and has the right to be different. Seeing before and after pictures proves that there are "REAL" improvements. I see that as a fact and facts are hard to argue with.