This game is so small in scale, that they have to rework everything after just 3 months every time. After a month a lot of people were maxed out, that means they have to find a way to keep them hooked. Levels beyond 20 are tied to gear, so they can't just raise the cap and be done with it. Just adding a few nodes would mean a week of grinding and then you're 32 with weapons maxed to the new cap.
If this game was bigger, more varied and everything a standard leveling system would've sufficed. But its not. So they do things like this, betting on gamers that are crazy enough to endure another few months of grinding for that overall increase.
Its bad, but I wasn't planning on buying the DLC anyway.
The current Exotic system is suspect too. Is it really easier as Deej says? I am fucking loaded with ass mats because of Raids, dailies, dismantles etc. Pre patch I could max all my exotics. Now I have to wait for Xur because I only had about 4 exotic things I could shard.