All operating systems need updating throughout their lifetime.A lot of the updates are to do with security,the bad guys are always working to compromise systems and so patches need to be developed.Some updates are to patch bugs that have come to light.
As for the updates interrupting your use of the machine,you can install the updates at a time of your choosing if you switch off automatic updating.As Windows updates are usually available on a monthly basis,I just check each month and then download/update while I'm doing something else,such as having dinner.