I'm surprised more people don't call this out but for me, iPad (and iPhone) are supported as managed work devices for me. Therefore my iPad doubles both as a personal device (surfing, social media, emails, youtube), as well as a work device where I can access outlook for emails/calendar, zoom, powerbi, teams, slack, etc... and having cellular built in means it's super useful when I walk around the city for work (used to be in a client facing role where I'd visit their sites) and can stop anywhere, access my OneNote, take minutes from meetings, access all the files on our server/my cloud storage, etc
Macbook Pro 14" is my computer when I sit at a desk or on couch and need to do stuff non-corporate work. iPhone is for taking photos/whatsapp/calling people/etc.