I find comments like this really interesting and infuriating in equal measure.
It's already been explained by the managers who want 5 subs why they aren't using 3 every game - it's because they are more worried about injuries so keep 2 back if they can rather than 1, in case they get caught short handed and playing with 10.
We already know they would use the extra subs if they could, because all of us watched the summer Project Restart football where Pep used 4.1 subs per game, and Klopp and others did similar.
So to still complain about not using 3 subs at this point you have to wilfully ignore all the clear and reasonable answers that have been put out there just so you can have a moan about something.