If you're interested in my 6step problem solving template, it's available for free through this link: https://www.tommentink.com/problemsol...

Those 4, 6 or even more main 'bones' in a #fishbone diagram show the categories that you use as the framework for your brainstorm, so they're an important part of how you steer that idea generation process. It's therefore important to choose these categories purposefully.
Most instances where you use the #Ishikawa diagram, it needs to broaden the scope (i.e. explore more possible problem causes; identify all important items to stabilize a process, ...). This works best when you use one of the common systems that covers the whole spectre of manufacturing, services or strategy. This video goes over the 4M of manufacturing (and a bit of 5M, 6M and even 8M), the 4S of services and a bit of info on the 8P of strategy/marketing.