I think the issue is that we use the language for 2 different concepts as if it were interchangeable-- low/high tech vs. low/high light. While high light tanks almost have to be high tech to succeed, low/medium light tanks can go either way.
Low light: under 2 wpg (note: standard issue lights are too low for this)
Medium light: 2-3 wpg
High light: over 3 wpg
Low tech: the "natural" system, low ferts, no co2 (or DIY at most), buckets, tend to be low to medium light
Moderate tech: tend to be low to medium light, co2 (usually DIY, but could be simple pressurized), more active management of ferts, possibly a python for water changes
Extreme high tech: more pics of what's under the tank than what's in it, usually high light, pressurized co2 (the fancy kind), co2 and ferts kept at high levels to force growth (makes me think of plants on steroids
plant growth is lush and rapid, but not exactly natural looking), if you want to get really crazy you can include automatic water changers, automatic feeders, and automatic anything else you can think of.
I'll even go out on a limb and say high tech tanks focus primarily on the plants, where lower tech tanks tend more toward an integration of fish, hardscape, and plants as a living picture.
Please note, I am not knocking high tech tanks. They are in-your-face gorgeous and nobody can see one without going "wow--I want that!" But they take a lot of maintenance. Low/moderate tech/light tanks take less work and are a little more forgiving. Granted, they won't turn as many heads, but they can still be beautiful. Gee--that sounds just like women.