I think Apple shows that it’s not really an inevitable problem with scale - they largely make products that stick around and are well integrated with each other while being huge in scale and scope.
IMO from the outside the problem with Google seems to be a lack of saying ‘no’ to people - they start so many different offerings without enough/any cohesion, bring stuff to market quite fast, then seemingly strip resources away as soon as they have gone live if the product isn’t instantly an overnight success.
Are you sure? I used to manage a department with over 100 Apple devices. Too many issues with sync on iCloud, iCal, keynote(etc). Sure works fine for 1-4 users (family). Even in hn people use fastmail, google maps in iPhone. There are so few suggestion to people move to apple email offering. People with Apple devices primarily use Google products.
I didn't claim they made perfect products - but they do make products that tend to stick around and work well with each other.
I don't use iCloud with Keynote myself, but those sort of sync issues always happen in multiuser apps that also allow offline editing (e.g. I get the same conflicts in O365 with Powerpoint because they are inevitable if you are allowing offline editing).
Apple will lock you out of email with no recourse just like Google, hence no suggestion to move to apple email offering. The point is to use your own domain, and use a business that cares about serving email.
IMO from the outside the problem with Google seems to be a lack of saying ‘no’ to people - they start so many different offerings without enough/any cohesion, bring stuff to market quite fast, then seemingly strip resources away as soon as they have gone live if the product isn’t instantly an overnight success.