Anyway, as I said, the end tier skills also tend to be the most expensive. While I’m sure there will be builds that take all the end tier skills, people will still need to pick skills throughout the tree to create a solid character, and we’re designing the skills to ensure they can continue to be as viable as possible regardless of character level. Some first and second tier skills will scale really well and I don’t doubt will be bread and butter for a number of builds.
And just an FYI repeat of info – The leveling progression is designed that you’d have all your skill tiers unlocked before you finish Normal.
The evolution of skill trees in Diablo III was quite tortuous, and if you didn’t follow it closely, you should check out the skill trees article in the wiki. It documents all the stages along the way, with screenshots, and it’s interesting to trace the trees, from their early D2-esque format to the current (finaly?) seven-tiered skill menu.
The new system was unveiled at Blizzcon 2010, and after using it there and discussing it in many threads since, I like the design. (You see a screen of it below.) It has a nice progression, offers a lot of variety, and is fairly user-friendly. The biggest question still remaining is how the skills will scale up with more points, and how they are balanced for long term use. Is the goal to keep low tier skills viable for use late in the game?
They were not in D2, since the higher tier skills were designed to be much more powerful. They had to be, since players could max out low tier skills in normal difficulty, and any skill by Clvl 50, when they were (theoretically) still in Nightmare difficulty. In D3 though, the skill caps will progress over time, perhaps tied to the difficulty level. Characters won’t be able to raise skills to Slvl 20 until Hell difficulty, or possibly even later. (Capped at 15 through Hell, with 20 only possible for end game use, enabled after defeating Diablo?)
That gradual increase to the Slvl cap, plus the fact that skill damage is largely a product of your character’s attributes, equipment, and Clvl, means that the devs could balance low tier skills to make them viable even in the end game. A Tier 1 skill with 5 or 10 points should be a lot less powerful than a Tier 7 skill with 5 or 10 points, but why not balance them to be equivalent at Slvl 20, giving end game characters vastly more potential skill variety?