You said that it would be easier for a vendor if it could expect to monopolise its customers.
Whilst that is doubtless true, that does not make anything better for customers.
Whilst that is doubtless true, that does not make anything better for customers.
If a company’s customers solely use their product, and not a mix of products, it’s much easier for the company to support and build new features for their customers. This is just a fact of reality, and one benefit of customers limiting the number of products they use.
Pointing out beneficial properties of consolidation and specialization doesn’t mean I support monopolies—I absolutely don’t.