When I was bush flying I would use all the features I could get.
Over a 100nm flight (1 leg) I would break it down into 2 halves and monitor from there. Other times I would stick to 30 min "checks" or if it was a shorter flight, 15 min checks.
If I had navaids, I would use them.
I guess it's important not to get too pedantic in this flying game. The rules that you described are more guidelines to assist you fly accurately.