PSA Haste does not waste a valuable spell slot

[Tyrande]

[...]

Has anyone given a logical reason other spells are better in those slots at high level yet, or are we still running of the you can't tell me what to do platform?

Suggestion (heightened) is better than Haste if the sorcerer cannot fit in Mass Suggestion in the level 6 spell slots. Example of an acid savant level 6 list:

Acid Fog, Flesh to Stone, Circle of Death (its too good a debuff spell to not carry), Disintegrate. (Greater Heroism with scrolls), and if Warforged, they also have to drop Circle of Death for Recronstruct; and take Suggestion at level 3, which means either no Haste or no Rage.

Halt Undead (heightened) is better than Haste in high level or epic quests where it is undead heavy like Black Loch, Crystal Cove or Wizard King, Necropolis 4 quests.