It's worth noting that "Encounter" doesn't necessarily mean "Combat," but the 6-8 encounter day is definitely bullshit. I think that framework is held over from very early releases, and if you want an idea of what a 6-8 encounter day would actually play like, Tyranny of Dragons' "Flames over Greennest" module pushes players to exhaustion with that many encounters before a punishing boss fight that you're intended to lose, and it's definitely not fun, especially because those caster classes just do not have the slots to spare at level 1.

It's clear how SR/LR resources evolved from daily/encounter powers in 4e, and that was a much more elegant way of handling resource expenditure, even if it did make all the classes play kind of the same.