I think the language barrier is a huge issue. It is quite amazing how some broke it and I wouldn't say the engagement is low. You might want to compare it with

I think the language barrier is a huge issue. It is quite amazing how some broke it and I wouldn't say the engagement is low. You might want to compare it with other Asian nations, but in some cases you just accidentally notice that you are in exchange with someone from there because the default language is English, which is obviously easier to learn for anyone using the latin script.