That does not mean that other players do not work well, if you prefer you could opt for SMPlayer, which also plays MKV. Although there are other players with which to view MKV in addition to many other video formats, I always advise you to choose the VLC player as it is one of the best multimedia players and in addition to having many references on the official MKV sites to the player, guaranteeing us that it will work properly without problems.