They are talking about Wi-Fi and disconnects and stuff like that stemming from the viewpoint that players want/should play ranked matches only with random people. Now, this is when I think a lot of ppl are getting wrong advice when it comes to the PS4 versions of the game.
I am currently at around 30 consecutive wins(I am new to Tekken 7, but not to Tekken in general), but the only reason that I play ranked is a) I am running an experiment about the ranking system and b) I just want to get high enough rank so that I can play sessions with ppl that don't know who I am and might consider me a scrub unless I am a Suzaku or something. I didn't exp any lag and I didn't have any disconnects from opponents, only they don't rematch after the first game(Im talking about playing rank from the very beginning line of the rank system). on PS4 > In Europe<<< I was able to get around 30 matches in roughly 2 hours. Now, let me say that I can only speak from my own exp. I have a lot of friends playing on PC though and the only thing that I can see that happens there is the faster load time in between matches. I play on PS4 and on pure principle I don't play Japanese and/or fighting games on PC.
Ok so I started recently going back to the game after I played briefly for a week or so after the release.