Warbringer
Explorer
I'm not an especially big fan of the Vancian mage. I was just trying to make the more narrow point that getting a 1st and a 2nd level spell at-will is useful for non-Vancian casters too.
Sorry, missed that; yes it is. The initial idea was introduced in 3.5, called reserve feats; if you have a spell available (say fireball) you could at-will cast a spell (like 2d6 damage) ... in 5e, way too late.
I love at will magic, an 6 years into my homebrew its been an option (been using the concept of at-will, 3/day and 1/day first introduced in 1e in monsters)