If your only concerned with performance on those rides, you're probably okay. Just don't start a ride low on fuel or water.

The bigger impact is that you've dug a hole, and post-ride it takes time to refuel and rehydrate. During that time, your body should be rebuilding but instead it's scavenging for fuel and hampered by lack of water. IOW staying ahead of fuel and hydration on a ride is as much about after the ride as during the ride.

It's also about developing habits that let your rides grow longer. Having the habit of ending a 2 hour ride dehydrated and out of gas is not conducive to future 3+ hour rides. The same thing is true for going from 200km to 300km, or 300km to 400km.