Still better than nothing

In time, you will need to replace a faucet and the supply riser connection will leak because o rings wear out. Then you'll need to replace the entire assembly. You'll also find out at that point that your angle stop doesn't shut off completely because o rings and washers wear out, especially if your water is chlorinated. Then you won't be able to stop the drip from the supply line until it's replaced. It'll happen every time you replace a faucet if the stops are more than about 10 years old.

I speak from personal experience.