That's not entirely true. You can uninstall Apple Maps and Apple Calendar, among many others: https://support.apple.com/en-ph/HT211833 https://support.apple.com

That's not entirely true. You can uninstall Apple Maps and Apple Calendar, among many others: https://support.apple.com/en-ph/HT211833 https://support.apple.com/en-ph/HT211833 And you can set another email client or browser as default https://support.apple.com/en-gb/HT211336 https://support.apple.com/en-gb/HT211336, albeit not a calendar app.