You are right there are simple PCBs like two layers and then there are multi layer impedance controlled PCBs. Another complexity is the size of pitch(ball to ball distance) that needs to be imprint to solder complex semiconductor chips. There are various kinds of materials used in different kind of PCBs, that requires material knowledge. PCB manufacturing is also understanding, a bit of chemistry. In recent budget we saw some duty on PCBs imported that shall provide some tailwind. This would take off when component manufacturing takes off Vs assembly we are mostly doing in India.
Disclosure: Invested from much lower levels.
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