English has a disadvantage of pronunciations being often not mappable to the written form. I blame French for that

Of these three, I guess Hindi is the easiest to learn. Simple alphabet, two tenses, no special characters to know. I guess Korean is a close second. But all of them I'd consider easier to learn than English.

Grammatically I can think of quite a few. Korean, Japanese, and Hindi for example

ironically, I should first learn proper English before advocating for it :)

I think English has two advantages : 1- it is already very widely used 2- more importantly, it is a fairly simple language compared to French , German , Arabic , Mandarin etc. Can't really think of a language simpler than English

Mandarin also has no grammatical gender.

But I also get the "uncomfortable imperial" point