England can steal techs the whole game. Not only early, but early, it goes so extreme fast. Especially early on, those fast free techs can give a great advantage. Unlocking faster necessary improvements, archer, fishing boats and spearman, this is extremely helpful.
I agree with the religious point, but it's only 3-5 faith per city, it's good to found, but nothing special for late game like Byzantium have. And which super expensive tech do you want to unlock with Ethiopia? You found your religion in classical and improve it in medieval, finishing the medieval tree happen in renaissance or early industrial. Only finishing the industrial tree can give an expensive tech, afterwards you are grinding the ideology tenets.
And all the techs you gain by your UA can be stolen from England. Except the point you can found earlier and with higher chance, Ethiopia is far inferior to England technology wise.