I know that now (and yes it was me) but LED still changes one of regular TNs greatest flaws, the viewing angle. Due to a much stronger backlight there isn't anywhere near as much colour shift/brightness shift as you move away from the optimum view angle.
So being brighter helps the viewing angles?
The LEDs used in those types of panels, lower end TN monitors, is often WLED, which is inferior to CCFL in color gamut. Color accuracy is impacted. RGB LED is better.
Many of them are also just edge lit and not full array (this may be different with desktop displays but most laptops use edge lit to save power so maybe craptops just have crappier displays which goes to show it's a panel to panel and not backlighting to backlighting issue). Many may have big backlight bleed issues (this craptop is one) and Blacks may appear a bit bright/Blue. Uniformity/contrast can suffer and at least in my experience with this craptop's LED backlit display, more than negates any potential (if it's even there...) increased viewing angles advantages (this may be why if I go
here, the viewing angles seem better, but in real viewing, the uniformity is so poor that it seems to have worse viewing angles in practice).
They have lower power because they use a minimal amount of LEDs.
This may or may not apply a given LED backlit panel. I'm not saying it applies to all. I'm just giving some examples of potential downsides in practice to show it's not an apples to apples thing. I told you before, it's panel to panel. The backlighting has an influence, but it's in how it's used. LED is not necessarily better. In practice, it's often arguably worse.
