What are the most common issues with existing software vendors

As a professional, an employee, a business owner we all have at some point in our work used software. For enterprise software we (or the IT department) in most cases have to purchase it from a software vendor. So in your experience what are the issues in purchasing enterprise software? I have listed my personal bad experience below:
* High CAPEX and very high TCO (total cost of ownership)
* Vendor lock-in
* Only around 10% of the features and functionalities are actually used
* Users can not integrate their data and way of working to the platform
* Lack of customisability resulting to unused software
* Lack of flexibility and scalability
* Software becomes outdated once requirement changes