While couples have the right to set their own wedding rules, guests have an equal right to decline. Weddings are meant to be a celebration, not a summons. In the thread, the OP reassured a user that ...

Whether you choose to include a RSVP card in your invitation suite or create a QR code for your guests to virtually respond ...

Pay attention to whether an invitation includes an RSVP, how the invitation is delivered, and the expected response date.