We are very clear, if there was not Newtonian theory, we should not have car and satellite and many other productions. If there was not the Faraday's law of induction, we should not have electric power. If there was not the Rutherford-Bohr atomic model and quantum theory, we should not have modern instruments, such as mobile phone and PC.
But, if there was not Einstein's theory of relativity, what we should not have?
Einstein's theory of relativity has never contributed anything to our world, why it is a great theory?
This is a determined problem for Einstein's theory of relativity. So, relativists faked that the GPS need be corrected with the Hafele-keating experiment. But, factually, the Hafele-keating experiment is incredible.
About the related problems, please see:
https://www.researchgate.net/publication/317014509_Anti-ethics_and_pseudoscience_On_Albert_Einstein%27s_theory_of_relativity?_iepl%5BviewId%5D=lmS8LttWr3vYBHFt7BsP4F5q&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A317014509&_iepl%5BinteractionType%5D=publicationTitle