> it strikes me that more big companies would rather have a one-stop shop full of 80% solutions than pay for 100 different SaaS.
Strongly agree (unfortunately I might add, because I'm not a fan of "the big just keep getting bigger). When it comes to data management, tons of companies are really concerned about access controls, policies and DLP (data loss prevention). In my experience setting up these policies and rules correctly, and appropriately monitoring them, is very difficult and easy to get wrong (many data breaches are a consequence of this). This is especially common when you need to bidirectionally share content with third parties, you may want to give some of those parties access control rights on some data buckets, etc.
I was at a previous company where we were essentially all on Google Workspace. Google Drive's access controls for sharing with third parties used to really suck, though they've improved in recent years. We had teams that wanted to use Dropbox enterprise because their third party sharing features were much, much better. The problem is that I spent a ton of time learning all of the access control and management policies in Google Drive (which aren't great, mind you), and then I needed to spend another large amount of time learning an entirely different interface and set of rules for Dropbox. I almost had a breach because a checkbox buried down somewhere was checked incorrectly. Also, adding Dropbox meant I had a host of additional SOC 2 compliance checks that I needed to validate.
Meanwhile, sharing features in Google Drive (of Google Workspace) have largely gotten "good enough", as of the past couple years.