The museum sector is, probably more than others, saddled by the lack of a proper information management strategy (you may call it digital strategy, or just strategy): the typical medium to large museum will manage its museum collections, its archive and its library with three different software solutions and publish each of them (when possible) on the web using either different platforms (vendor specific) or different integrations. If they have donors, these will be stored in separate systems and databases (often more than one), so there is no way to know that, for example, an artist in the collection is also a donor. And so on, spanning to another five or six silos of information, all of which are crucial to the museum's operations. In addition, because many of these systems, even when they are dedicated, are inadequate, lots of important information is on Word and Excel files, on people's computer, not backed up and not centrally accessible.
In addition, if and when integrations between different systems happen, they don't start from the ground up: integrations are more often than not added components on top of the existing (messy) landscape, so when any of the underlying components changes or it is upgraded, the integration crumbles. Would you build a house on unsafe foundations, that you already know are wrong?
All of this is doing software vendors a massive favour, as they can sell museums more of the same: more systems, more training, more integration services and more APIs (yes, I know of a company that charges extra for its API: madness). Why does this happen? In my experience it is because there is a widespread lack of understanding of what a software system is and what it should and ought to do. I taught many workshops on database design to museum database administrators, where I was a little shy asking if I should not cover basic concepts like one-to-many and many-to-many relationships, as they are the bread and butter. My audiences told me to start from an even lower level - as they didn't really know what a database was or how it worked. So they buy the equivalent of black boxes.