i have see lots of private server using 2016 client already.. and as i told u.. nothing wrong with using newer clients. perhaps that the owner willing to contribute by proposing push request.. but, in this case, like what akkarin said, most of the server owner, they do their own background work and then don't bother sharing it, because "they're the best servers because they have newer stuff". in much more simple words.. the server owner want to be their server so exclusive.. and i have meet few of them.. so, if by helping others will help back this emulator in speed up supporting more newer client, so why not to contribute to it?