If I understand your logic correctly, it seems that you are suggesting that a country or a community should either reinvent every useful thing that was introduced by colonialists or should not take a stand against the ideas of colonialism, racism and discrimination!
It's a fact that Britishers introduced a lot of technology in this world and helped bring it to many countries but I feel that it would have been much better if they would have tried to integrate with these countries rather than trying to follow a master-slave approach. Anyways, what's done is done but we can certainly hope that going forward the world can be a more equal place.