removing repos & addons

I have been using Kodi for a while. I don’t use the ‘one click add all’ method but just add the ones that I want, as I know it is the method advised.
What I want to know is what to do with addons either not being used or not working. I just generally uninstall them, but is it advised to go one step further and remove the associated repo (assuming that repo is not needed for another addon being used) and even the source. I want my kodi to run as smoothly as possible