There are phenomena in the universe that, for example, general relativity does not predict correctly. Is your conclusion that we should discard any useful theor

There are phenomena in the universe that, for example, general relativity does not predict correctly. Is your conclusion that we should discard any useful theory which ever fails to match an observation? Would someone who relied on Newtonian dynamics 100 years ago likewise be incorrect to do so because it failed to explain many aspects of planetary motion?