Same here. Corals get dipped and right in. Never lost a coral doing that even with wild (I'm talking >0.005) differences in sg.This is how I have always done it, I never truly acclimate except temp. Always keep holding tank at 1.025 and dilute to what fish arrive at. Evap brings salinity back up.
I don’t acclimate corals except temp also. Clams I acclimate but not sure if it’s needed.
This (plus a dip) is basically all I do.
For fish I have a seperate tank with fresh oxygenated water that I can adjust and usually call ahead to ask the vendor so it can be ready long before the fish arrives (I still test). Then once temp is close I just put the fish into that water.