There are market places for selling items, both for in game cash and real money. I agree that it’s a legitimate criticism that it’s not in actual game itself, but then you develop weird incentive structures like FIFA’s pack openings taking precedence over actually playing soccer, which also feels bad, and potentially more exploitative (if I just hit this rare car I could turn a profit!!)
The complaint isn't about depreciation but rather the inability sell the items at all.