As I understand it, safe standing increases capacity in that area, so they'll be more people.
And when it comes to things like wanting to be with a group of mates (which does help atmosphere), you can easily do so.
At the moment I'm a STH in the Northam. If one of my mates wants to get a ticket and be near us, they have to buy a ticket 10-15 rows away.
Would love to have a whole End behind a goal as safe standing for home fans.