Every commercial PCB manufacturer whether doing it in small scale or big scale would have to procure Prototype SMT Stencils at the start of their new production.
PCB manufacturers who are assembling PCBs with microelectronic components have advanced options while procuring laser cut stencils. Fine Line Stencil technology suggests using SLIC and Ultra SLIC stencils.
I assume you have seen PCB on thin fiber like sheets that are easily glued on to the SMT Stencil. These sheets are called SLIC stencils that can support miniature sized chips and semi-conductors.
The world of electronic gadgets is getting smaller. The future of prototype stencil developing is going to meet tough challenger from the production engineers.