On the other hand our IT recently blocked external sharing of calendars, which I'd used to gain read-only access to my work calendar on my private phone and I bloody hate it – by the time the browser and Outlook have loaded on my under-powered phone, I could have launched my calendar app ten times over, plus the work calendar is now no longer integrated with the system calendar APIs so it no longer appears on my homescreen calendar widget, I now I have to switch back and forth between separate apps for my private and my work calendar, offline access only works so-so and wastes additional space, etc. etc.

(Plus I don't want to actually deal with full Outlook because I have zero interest in accessing my work mail privately, whereas I do need to take a look at my work calendar in order to avoid accidentally double-booking myself.)