Right, but when you're on the ball, what are the end purposes of positional discipline?
Firstly, the player on the ball knows the rough areas for his passing options.
Secondly, the pass when executed covers ground leading to an overall quick movement of the ball across greater areas of the pitch, forcing a defensive response and creating space elsewhere.
Thirdly, the receiving player is in a position to continue this pattern.
Fourthly, if there's a turnover there's an upper limit on the mean time to recover and press.
While all of these aspects have been understood for a long time, the way this current Arsenal does things like peel the outer players off a double defensive row by repeatedly cycling the ball from the wide man to the 8 (Saka to Øde, or Martinelli to Xhaka / Zinchenko) goes far beyond the equivalents we saw in Wenger's era—when those players were (for example), Nasri plus Sagna pushing up—in the detail of its intentions.