Mac Catalyst apps use the LSMinimumSystemVersion value (corresponding with a macOS version) in their Info.plists.

Usually Mac Catalyst projects will be created from an iOS project (either multi-targeting, or copy-paste-modified), in which case we'll have a MinimumOSVersion value.

This enhancement would be to compute the correct LSMinimumSystemVersion value for a given MinimumOSVersion (unless a LSMinimumSystemVersion is present), this way there will be less differences with any iOS projects.

We already have code in mtouch to convert between iOS and macOS version for Mac Catalyst.