I used to do that, but if you make changes you end up deleting the merged and remaking it. So it just sits there, hidden in case you make changes to your bake settings. Also depending on how dense the scene is and how big of an impact the floaters have doubling them up could really bog things down. If you forget they're…
You can bake multiple floaters onto a single object without merging them all together. You need to add the projection modifier to the lowpoly object, then in the reference geo tab click pick and one by one select all the objects you want to be projected onto the low poly. Set up the cage like normal and then in the RTT…