and is it any drawback of length matching the pairs?
Yes, the drawback you get is you need to read whining on the EEVblog forum even when your problem is totally unrelated. TLMJW's, or Trace Length Matching Justice Warriors, looking to comment on "unnecessary" trace length matching, is the new trend now after the DGND/AGND dead horse has become too stinky.
I understand the irony in length-matching a 10kHz I2C or a blinking LED IOs, and I tend to have a laugh as well. But really, this
is a fairly high-speed impedance controlled design which, while working just fine without it, is not
too far from the design territory where the length matching starts to really matter.
But TLMJW's are pissed because now every beginner can use the simple length-matching tool in their PCB packages so it's not their high-speed black art anymore.