Inbound rules in a decent size company are critical. Things like Okta, business apps like oracle ebs/obi that are inbound for invoice approval etc. then there is rules to allow FTP, inbound for payroll etc. Is the Meraki considered an Enterprise platform? It should not take a support ticket to implement an inbound rule.
1:1 Nat should address this and perhaps policies are able to be configured once Nat is available.
Sonicwalls and Palo both have inbound capabilities out of the box. I’m sure Meraki does and perhaps the configuration is just a bit challenging like all new platforms.