Buy back clauses are also the lesser evil compared to the alternative which is big clubs hoarding young players and shipping them out on different loans for half their careers. And I’m struggling to think of many that have been actually exercised.
Deulofeu for us back to Barca, off the top of my head. In general, only the biggest clubs have enough talent to farm it out for development with a sale-buyback deal, and they're not selling if they think the player is likely to slot in as a rotation player in the immediate future. We don't see a ton of options picked up because relatively few players in that bin break through hard enough to get behemoth clubs to exercise the option.
Would the young players agents just get savvy and not sign long term deals and if there are signs they aren't going to get a chance, just go elsewhere for 1st team football?
Couldn't this go hand in hand with limiting the amount of loans to other clubs you can do to stop stockpiling young players?
Not feasible due to the risk of injury. When they're young, they effectively have to sell a stake in their lottery ticket for immediate financial security, should one horrible moment undo everything. In practice, the biggest talents break through, and the next tier tends to force their way to places like Dortmund and Leipzig to prove they're the real deal.