New
#1
I assume there was a reason you installed it.
Most people don't have a reason to install.
There can be components that you could use like Windows DeBuGger or maybe the Performance Tool. All take work to learn and use. You may also be into app development.
The folks in the BSOD section of the forum use the debugger.
Ken
The Windows 10 SDK is primarily intended for developers. If you are it will be useful to you. Otherwise you probably don't need it, although some components may be useful. Only you can decide this. The large majority of Windows 10 users don't know what it is and would have no use for it. Usually such things are not installed unless have a specific reason to do so.