[haikuginger]

Plus, many of the integrated apps actually do support the platforms he's using - for example, Google syncing with the macOS Contacts, Calendar, and Reminders applications.

Additionally, the macOS Messages app is way more capable than most people realize. Of course it supports iMessage, but it also supports sending native SMSs when used with a paired iPhone, either via relay or through WiFi calling with a supported carrier. It also has Hangouts chat support AFAICT, and support for any other (standardized, decentralized) XMPP/Jabber server.

And the majority of the other applications come preinstalled, but can just be deleted.