Warfare could be altered to not boost damage done by bows, crossbows, daggers, and Necromancy spells. If that is changed, then it is no longer One Ability to Rule Them All, and thus making Ranged, Scoundrel/Dual Wielding and Necromancy actually worth putting points into instead of Warfare.
If Scoundrel/Dual Wielding actually worked, people would put points into it now and it clearly doesn't. Not just because Warfare is better, but because the other two options
suck until Warfare is maxed. Rogues do pathetic damage without Warfare and neither Warriors or Rogues start doing really high damage until the later half of Act 2 when the game is over half finished.
You're both essentially wanting Classic to turn into Tactician and Tactician to become pointless due to it not actually being possible outside of dual Lone Wolf. How does this make Necromancy more viable anyway? It's a garbage tree other than two abilities and neither of them actually scale with stats in the first place.
