[dangerlibrary]

You seem to be operating under the assumption that an integrated product will necessarily be cheaper, as opposed to simply more convenient.

That's definitely not a necessary result of a combined product offering, but it's interesting to think about.

[arkitaip]

It's often much cheaper. Take a look at What Microsoft offers with their Office 365 subscription plans or Zoho One.

[dangerlibrary]

This topic is pretty well studied and discussed elsewhere, often in the context of antitrust. The Google-able phrase would probably be "bundling vs unbundling" or similar. It's not _always_ the case that a bundled product is cheaper, though, as you point out, often it is.

There are many lawyers representing companies accused of monopolistic behavior who would be on your side of this discussion.