It appears one of my wishes has been granted.
When you have Catalyst switches in Meraki management mode in an MS network you have that annoying thing where trunk ports always need to be a defined list because all VLANs on a trunk in an MS network are actually created on the switches. However since Catalyst switches use their CAM and TCAM space differently you are limited to creating 1000 VLANs simultaneously on C9300 switches and 500 on C9200 switches.
Thanks to the VLAN database feature you can now define a commalist of the actually used VLANs inside a network. By doing this you limit the amount of VLANs being created on the Catalyst switches.
The payoff of this feature is that you now once again can use trunk allowed vlan all on all the Catalyst trunk ports. So in case of a mixed MS and Catalyst network you can have all your trunk ports have an identical port config.
https://documentation.meraki.com/General_Administration/Cross-Platform_Content/VLAN_Profiles inside this document you have the VLAN database feature which is awesome!
Only important note is that if you use VLAN names you need to actually add all those VLANs to the active used VLANs.
