I disagree, especially with a family that can ride all the rides. Rider switch works for rides where there are children too small to ride. I know there are other use cases, but this is the biggest reason. Otherwise, families would not be able to ride the ride at all. It is a choice to separate for the time required to do the standby for the several rides that might require it.
It is unreasonable for families to spend a good portion of the day away from the whole family because that is the only accommodation available.
Rider swap has also been modified over the years. Generally, it was
only for families with children that were too short to ride, but sometimes CM's would make exceptions if a child was too scared to ride.
At one point, child swap was done via paper passes. At some point, the second group could be up to 4 people.
Back when Soarin' was newer, Soarin' was a bit more restrictive than other rides. It was a while ago, but I think for Soarin', a rider swap was only issued if the first group used the standby queue. If the family had FP, they were sometimes denied a child swap pass.
Most other rides, if a family of say 7 qualified for rider swap, then a group of 5 rode the attraction while 1adult+the child waited. They could request a child swap even if they were using paper FP. When they got off the ride, a group of 4 could go on the ride using the pass in the FP lane. I'm not sure if rider swap can be paired with G+.
At some point, the pass was changed. I have not used a pass recently, but - I think- the pass now only allows 2 people to use the LL.
Always some % of people using the LL (for rides with a height restriction) is for Rider swap users. Rider swap is NOT available for rides that do not have a height restriction, so it was never offered at HM, for example.
If WDW plans to expand rider swap, it is unknown how it will be implemented. (who will qualify)