Obliged to warm up with the opponent before a tournament

Thanks a lot!

In lower level tournaments,we sometimes skip the warmup if both players are just after another match.

Or when one of the players has especially junk rubber

We don't skip it, even in lower-level club matches and even if we have both just come off the back of a previous match.  It allow each player to get some idea of how the other player's rubber behaves and the general quality of their shots.  It means you don't need to waste the first few points of the first game doing that.

Well,it often happens when both players know each other very well,for example if you clash with your training mate.

True DK. However I see it as an 'adjustment' process - either from not playing to playing or from one opponent to another. If it is a first match, you need to get your hand-eye coordination dialed in and if you've just come off another match (or another table), you need to adjust from the previous opponent's style to the next one, even if you've played them many times before.

Even at work where we know each other's styles very well, when playing a 'champion round-robin' we don't skip the warm up when switching players, although we do reduce it to 1 minute to keep things moving.

The warm up really does improve the quality of the first few points in a match.

Yea,could be.
I understand it.
Of course we dont skip it in the first match,but as I said,if both me and my opponent for example played 3+ matches in a row and we play our last match for i.e. 15th rank so we really want to start fast as we are both already tired and we have nothin high to fight for.