Totally agree here. I'd much rather mask a job off really well then have to deal with cleaning plaster off windows/doors, etc. So much cleaner and better results for a few extra bucks and the GC or homeowner always loves it.
It seems like you guys trowel down your walls much more than we do. (or me rather since I can't speak for the entire US) Maybe its just the difference in product but when I do smooth coat I lay on, double back on it right away. Wait till just before it starts to get stiff and do a first trowel. This one gets rid of any 'cat faces' in the plaster and eliminates any lines that may have been left. 2nd trowel as it gets stiff. This one gets rid of the lap lines from the strokes of the trowel if there were any still visible. Then 1 more pass with a wet mop after it's pretty much set for a nice buttery finish. If you want it to shine you can do another quick pass with the mop but it's really not necessary. I like to use lime/gauging over green base coat when I can, but if price is a factor I'll do it using Diamond veneer finish or Xkal which goes right over blueboard. (I assume you guys have a special board for plaster right? Ours are color coded and blueboard is for plaster. I really have no clue what materials are available over there or how they compare.

)
I am curious about sponging and I've looked into it but Refina isn't available here in the US. The closest thing I can find is a sponge float for stucco but I'm not sure that would do the trick. What is the consistency of the sponge like? It looks like a typical open cell cellouse sponge but hard to tell just from pictures.