My fear with this new light system is that...it doesn't change anything?
They aren't going to have something stupid like for hard mode of the new raid, you need to be level 40 and have a light average of 300 or something right?
Because that would be stupid and is basically what we have now.
The problem with Light levels wasn't really the fact that you needed better gear to do harder content. It was that getting gear which met these requirements was totally random and beyond your control. It was luck based. The Dark Below fixed this to a certain extent with significantly higher drop rates for raid armor vs. VoG.
But since HoW, the Light system isn't really punishing. If you start playing today, you can roadmap your progress to level 35 very neatly. Vendor armor - without any upgrades required - takes you to level 32. At 32, you can earn PoE gear, which goes up to 34. No randomness. Coupled with Etheric alight and Exotics, it's a damn flexible system.
So to be honest, the whole problem with Light Level gating of content is largely solved. There's no #forever33. The system allows for predictable, measurable progression which only depends on luck if you wanna speed up (via Etheric Light), but worst-case scenario is 4 resets doing PoE 32 for max level. Done.
The problem now is far less serious. It's petty, even. While the current system works, is flexible, non-random and leaves nobody behind...it's messy.
Making armor give us a more traditional concept of Armor stat (proxy via Light) makes it far easier to understand what the stat does. As in, it's not my level - it's my armor/attack.
Doing away with the completely uninterpretable "I have 1578 Defense" and changing it to "____ Light" makes more sense.