Manufacturing is the art of trial and many errors. Be it mechanical designs or PCB manufacturing, it helps to know the limits of what is possible. It is very good to know what are the perks and limits of every manufacturing technology and to match the method to the number of units actually intended to manufacture. Did you know that each manufacturer you approach first asks the expected number of units per year? Even if this is a prototype!
Negotiating with a PCB manufacturer for the correct stackup can take a long time. As I have escorted many PCBs before to manufacturing, from POC stages, I have wide view of available materials, manufacturing methods, do’s and dont’s.