Because it requires no coordination on the recipient's end. Using EDI or Peppol both require parties to establish connections first; hybrid PDF can be sent via Email as usual, buyers' systems automatically parse it if available, or treat it as a standard PDF if not. Neither side breaks.
Full details and tax ID checklist: https://patisco.com/zh/eu-check/e-invoicing Check which EU regulations apply to you by tax ID: https://patisco.com/zh/eu-check