Why spend 70 build (on 3 weapon proffs and ohe )
The worry here, for me, is that the way 2.0 is now, I think all Spellswords are going to only get 3 Profs and then just buy spells and other skills. I don't seem them investing in more profs than just because of the scaling costs, and Slay/ImpSlay scaling just isn't going to be worth it, I think. Particularly at higher levels when Damage is going to be less important than take-out effects.
It is 27 build for a SpellWord to get that 4th Prof to swing for 6. That is 3 build shy of another column of spells.
Prof 5 is 30 build, which is another column of spells, which is multiple take-out effects, and damage/healing, plus Wand Packets, Plus wand damage increase passively the more build spent, just for the ability to swing +1 damage in a game where damage is marginalized. This is further compounded by NPC's naturally scaling damage down to more easily managed numbers (5) to calculate more quickly.
I feel like this is a bit worse for Adepts because they have to spend build on an additional (4th) BackStab so that they can swing for an even 10.
This, again, goes against the stated goal of giving classes/players options. From a build efficiency standpoint, I feel like it's going to be even WORSE for Adepts/Spellswords and to a lesser extent, Scouts, than it is in 1.3. I feel like there's more build diversity among Adept/Templar now, just based on BS/Prof purchases and focus because going into another Prof/BS isn't necessarily a bad thing for those classes. But because of the scaling costs of those skills now, those two classes will cap out, likely, at 5 damage for Fighters and 10 Damage from behind for Rogues and then all build aside from that will be for whatever Rogue/Fighter skills they are able to buy, and then just Spells (and Paragons if those go through). I just don't see a whole lot of build diversity there.