It's not "bollocks", it's a fact. Lots of businesses that go cloud replace API calls with external apps. People used to do human resources management via Excel and Outlook with macros and plugins, now they use BambooHR or Workday, for instance.
Of course there will also be lots of businesses that don't, but I haven't seen that in the last 13 years of working in the field. And in that time I went through companies as small as 200 users to as large as 180 000 users.
That is being cut off in an anticompetitive move by Microsoft
Agreed. Kinda. Email should be email, nothing else. It's not secure enough for anything else. If you want fancy features, get a fancy app that can do them, maybe have it send notifications to your mailbox, that's it.
It allows for information management and automation to be verified by people with simplicity and a familiar UX
With this I don't agree. Again, email is email - third party (or custom) software can do these things infinitely better. As for "familiar UX" - come on, it's 2025. If someone can't handle a new UI/UX, they shouldn't be doing office work.