In my experience putting two programmers on same task can even lead to less than 1x the output of a single person. People often argue about relatively pointless things while neither decision is not wrong. A single programmer would just go ahead and pick their own way and second one wouldn't consider it as important to raise during a review.

Pair programming is great for new employees. But I am not sure either how much value they add over properly done design or code reviews when it comes to stability and putting two capable programmer on the same task sure sounds a waste of time.

I think people that pairs up on same tasks/epics should try to work on different parts on parallel and try to sync up on what and roughly how they want to do stuff.