1) Short and to the point – As far as learning how to pronounce words and read them.
2) Uniformity – Which helps to speed up learning because you don’t have to remember how to pronounce the “o” as in sock or coke – completely different sounds, and you would only know this through living and speaking the language and culture every day.
3) Nothing to hide – I’m referring to shibboleths, means of tripping up foreign speakers (or spies for that matter) by using odd rules of pronunciation or word usage in grammar. The Schwa Syncope Rule in Hindi is such a method, because it has to do with deletion of the final vowel sound in words and even medially within a word. It would be one thing is this was completely uniform, but no… In Hindi, this rule applies only 89% of the time, which can be used to trip up the spies attempting to pass as a villager nearby. You have to know which words to use the deletion on and how in the context of a conversation. English has plenty of these things because speakers of English have had many enemies, which leads to…
4) Civilizational functioning – This means that because it is short and to the point in learning (though complex, but this short and to the point at the foundation characteristic allows one to learn advanced language concepts without being bogged down with lower-level details like, “Why do I have to pronounce ‘acted’ and ‘happened’ at the end differently?”), you are able to gather language skills in a shorter period of time in the beginning. It took time to develop the ability to teach rapidly, did it not? The second thing is, because of uniform pronunciation and standardized grammar later on, there was no need to hide from a foreign visitor (regarded as someone 200-300 km from your village after several days’ walk) anything of strategic importance. The key is trust. Because it was assumed that people in this land were Dharmis of some sort, you could trust that they would be honorable and trustworthy. Europe was the opposite, living as barbarians having to sleep with one eye open at all times because European civilization had devolved to the point of not being able to trust your own wife in some circumstances. This means civilization functioned at a higher level because it wasn’t distracted with constant warring (though warring was conducted differently – showing decorum in respect to citizens who had nothing to do with the reason for wars), spying on one another, and being on the defensive constantly. Or how about being on the offensive, trying to expand constantly at the expense of what was happening at home (read: Holy Roman Empire)?