Not understanding mechanics and the importance of positioning isn't a failure on the part of the game.
Wizards are almost a little too strong this early in the game, and I have zero issues with landing my spells because I understand that height, distance, and lighting play a critical role in spellcasting success.
Lighting? How?
Lighting or rather visibility affect spells that target AC, that's what he meant I assume. On a target that is obscured by shadows, for example, you get disadvantage.
