The USGA Rules app is very handy. Had to show someone that you can get the “Full Rules” and also the “Interpretations” by changing your settings. I still carry the paperback Rules book in my bag as backup to the app.
A lot of people who play in the WA really do not have more than a casual grasp of the rules. Yet others know them very well but will still try to get someone in their group to go along with them if they end up in a situation they don’t like and want relief. Seen it happen many times.