I've heard some people suggest that at 18 you should be allowed to get either a license to buy/drink alcohol or a license to drive, but until age 21, you can't

I've heard some people suggest that at 18 you should be allowed to get either a license to buy/drink alcohol or a license to drive, but until age 21, you can't have both. I'm lukewarm on this idea because it seems so easy to evade: get a driver's license and then ask a peer with a drinking license to get you your booze. But the current system certainly seems broken to me, and maybe a split-license system would be more politically feasible than simply lowering the drinking age to 18.