Enterprise is where you have average developers with mediocre managers and ill-formed specifications working to inadequate (but overrunning) budgets. Something gets nailed together to support the business, and once it's working you're never allowed to touch it again. The king of this kind of line-of-business app used to be VB6. There was a brief phase were people wrote intranet applications with embedded ActiveX controls and got permanently stuck on IE6. These days it's more likely to involve SAP or Sharepoint.
These customers made Microsoft a lot of money from all those desktops and Windows Server client access licenses, but they're extremely conservative.
And maybe they have a point; I can see what the advantage of UWP is for Microsoft, but as a developer it's not a clear win over WinForms.