The ultimate does also work nicely with the AP
This is not an excuse to have lich bane, since the ultimate tends to knock enemies out of attack range, and the only reason to have lich bane is to attack people after using abilities.
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This is how you win as nidalee, ap is good early but lategame tanky wins
1. I've said this over and over again and I guess I'll say it again: "The type of people who write guides are not the same type of people who win tournaments" - RIOT dev who shall remain nameless
Seriously of all the guides I could write, I already know before-hand that my most informative ones that show people things they might honestly need to know about are the ones that would get the most downvotes. Meanwhile my cookie-cutter stuff that people could figure out for themselves just by watching other players would get upvotes because it "sounds right."
2. Flat AP and magic pen runes are a way to hax AP nid into being useful early on, and that's pretty awesome because it's a very rare example of being able to do anything like that (mostly because it's so rare for anything to have such crazy AP ratios as her spear). But if you don't specifically do that one thing and try to play AP nid... well I already hinted at my point by saying that nid's spear has ridiculous AP ratios: AP nid's damage potential never goes down as the game progresses at all. My nid mostly relies on base values until the end game and deals no damage at all until about 35-37 minutes, and at 47 she's wiping out 1/3 of the main tank's HP on spear pot shots every <4 seconds with infinite mana. As someone with a bunch of avarice and cooldown runes, I have a lot of trouble dealing as much magic damage with most casters at that point in the game as I do with AP nid. If she really couldn't keep up in the late game, I wouldn't bother to be buying any AP on her at the 40 minute mark; it would only take one or two games to realize that it was not really making a difference.
This isn't an argument that a DPS nid is inferior, just an assertion that calling AP nid unviable
in the late game is adding an unnecessary extra layer of error that only further proves that your presumptions far exceed your practical experience. Even kevin is making more insightful posts and as far as I remember he's played way less than you. Maybe you should think about being less provocative and focus a little more on principles instead of conclusions.