I always get into JP party very often and know most of them.

well I don't know about exp-party because it has been long that I never do any. But for end-game party, they intentionally speak JP so that they can screen out those who has no basic JP reading skill.

But lazy is also part of the problem too. They tell me once before that Auto-translate only work when they type JP word in polite and full word. But most people doesn't talk that much polite, and it is faster to type using shorter word.

Example: People rather says : よろしく　　　instead of よろしくお願いします　

So in English, it is easier to just type a little bit and then auto-word.
But in Japan, it is easier to just type it shorten than auto-word.