> So what happens is a corporation ends up spending a lot of money for a square tool [SaaS] that they have to hammer into a circle hole.

You are assuming that corporations have the capability to design the software they need.

There are many benefits to SaaS software, and some significant costs (e.g. integration).

One major benefit of SaaS is domain knowledge and most people underestimate the complexity of even well known domains (e.g. accounts).

Companies also underestimate the difficulty of aligning diverging political needs within the business, and they underestimate the expense of distraction on a non-core area that there is no business advantage to becoming competent at. As a vendor sometimes our job was simply to be the least worst solution.

At least that's what I saw.