1. I had kept personal accounts for a while, until I realized my expenses swayed month-to-month, but within a narrow band (+- 10%). This made the "insights" less interesting and approximations worked well enough for my use case. I suspect that this is so, for most people.
For who have not kept personal accounts, what I am describing is similar to when you got your Fitbit - The first 2-3 weeks are full of glorious insights and a month goes by and you do not really need a fitbit to tell you how many steps you walked. Approximation approaches real count. Same for personal ledgers.
2. I now focus my efforts on income expansion rather than cost control. Some of you may say, recording costs is not controlling it. In that case, I find accounting, even less useful (once I have arrived at approximate cash outflow). Income expansion, puts me in a different frame, which I find strangely empowering. Even more so than the satisfaction that comes from having controlled costs.