the Jester
Legend
I think I would have liked a ritual cost revision so Rituals were not quite so free at high level nor quite so expensive at low levels
I really dislike sneaking rules changes into later books. If anything, I'd rather see a better balance on ritual cost vs. efficaciousness. But I never had a problem with rituals as is.
But to answer the question, what I wanted was less "paragon path A" and more a matter of style- I wanted more magic that wasn't strictly mechanical. Stuff like we later saw in Heroes of the Feywild and some of the other post-Essentials books- things that were a little 'looser' than the powers and items we'd mostly seen before.
I also would have liked to see more classic spells converted into 4e. There were a ton that never made it. I remember periodically being disappointed that I couldn't find a cool version of whatever old spell in 4e. There are especially some very cool old bard spells from the 2e Complete Bard's Handbook and 3e's Song and Silence that I would have loved to have versions of. Probably some magic items, too.
I do think a wizard necromancer path would have been cool. I think we eventually got one in Heroes of Shadow maybe? That was late enough in the edition that I never got to see it in action.