Hmmm... that's interesting. It would make sense that warriors/thief type characters get more perks than mages. However, the perk points on that screen may have several tiers to them (increase fire damage 5% with every point placed in this perk slot). The 280 estimate may also be the sum all of those tiers. In fact, I'm sure of it. 280 is too large of a number for all of those perks to be unique. This is also why I'm worried that many of them will be passive stat increases. Still, pure mages might take no thought at all when building if they are given so few magic perk options.
I can't say that I agree with you about the tier slots. It seems to go against the design of the perk trees, which would seem to be unlocked in a very linear fashion. I just can't envision; given that we only have 50 perks to choose from a possible 280, that I would have to select the same perk point 3 times for maximium use of that perk. Of course, it is possible that that could be the case in some instances, but I find it unlikely(actually I downright hope that's not the case)
I guess what I was trying to get at in my previous post, without saying it clearly, was that if you look at those magic skill trees, you can already guess how some of them branch off. Destruction obviously splits into fire, lightning, and frost/ice.
But when you get into something like 1 handed combat, for example, there are more branches that need to be addressed in the perk tree, creating the need for more perk points to accomodate the increased depth and possible specialization that that skill encompasses.
For example I imagine 1 handed combat branching something like this for specializations sake:
-longsword
-shortsword
-mace
-waraxe
-dagger
And 2 handed combat branching something like this:
-claymore
-warhammer
-battleaxe
-halberd
-hand-to-hand
The need for more branches obviously means the need for more perk points, which is where I think the surplus of points has gone. Not to mention the fact that magic by its very nature is already powerful and extraordinary, and by the sounds of the new magic system and spell effects, it promises to be visually stunning and spectacular. So with that said I would imagine the devs are putting extra care into 'spicing' up the monotonous nature of melee combat with the perk system. Here's hoping anyway, because you and I are in agreement, that too much passive perk stacking(tiers) is a bad thing.