MoonSong
Rules-lawyering drama queen but not a munchkin
But if you spend hours learning spears and light armors, you aren't spending hours learning and unlocking new spells.
Kinda makes sense. Dragon sorcerers are tougher not through training, you get resilient the second you unlock the power. Wild mages don't get scaly skin.
Now I could see a subclass of sorcerer with weapon proficiency if the flavor says the magic is "easy". Like a family of pureblood sorcerers where your power isn't as diluted or accidental like dragon sorcerers or wild mages.
But you don't get so many spells to unlock in the first place. A 1st level sorcerer knows only two, and the most powerful ones 15 -and they are the 1%- compared with the dozens of spells an average wizard knows, that leaves plenty of free time to learn to use that spear. (And if sorcerers are truly natural casters, they should need only a fraction of the time a wizard takes to learn a cantrip). On top there's the legacy issue, every previous version of the sorcerer knew how to use spears, darts and maces.