I distinguish between dust and chips. In my experience, through monitoring the dust in my shop while I work, the use of a zero clearance fence does not have an adverse effect on the dust collection. However, it does allow more chips to fall on the table. I couldn't care less about chips, because I can see them and they are not floating into my lungs.
I use a sacrificial backer board similar to the one in the photo you included because its fast, easy, and inexpensive. I usually have plenty of offcuts to use as needed.
I can't tell if you are serious with these questions, but have you ever seen any powered saw leave a perfectly smooth finish on the edge of the board (excluding MDF) with where the saw teeth exit?