I'm guilty as charged. Sometimes I have to step back from complexity and smell the roses.
On the Bogleheads Forum site, there was a mildly fierce (if ever there were such a thing) debate regarding the merits of devising a complex variable percentage withdrawal method for PF decumulation. Went on for several pages, even ending up as a spreadsheet on another part of the site. Best part was this sage advice (IMHO) from one of the posters regarding complexity:
"After long thought, and years of reading posts here, and just thinking about the well known fact from psychology that humans are very poorly wired to intuitively understand probability and make rational decisions in the face of uncertainty, I think people, otherwise very smart people, have an extremely hard time really at a gut level dealing with the level of uncertainty in investing and retirement planning that exists despite all our hard work to make it otherwise. Thus we agonize over hyper-precise rebalancing schemes, worry about precisely how to set an asset allocation, despite huge amounts of evidence that no one can estimate future returns with any accuracy we read and many (including our resident experts both those that post regularly and not so regularly) insist that to invest well we much make such predictions. And why we have such fascination with various safe withdrawal rate schemes.
I'm sympathetic. It took me a long time, and much modeling and calculating, not just in things like the above withdrawal rates, but more importantly in studying the sensitivity of results to changes in assumptions to get to where I am today. I would suggest that if anyone likes precise calculations, much can be learned by looking at the changes in results due to sensitivity to errors in assumptions. As a hint, just as compound growth in your portfolio over decades is a great thing, the compound growth in errors over decades is just as powerful.
One could certainly at age 30 calculate to the nearest dollar what they plan to spend at age 60. And people could get together to discuss different methods of how to do this calculation to the nearest dollar. But would it be very useful compared to a back of the envelop estimate? Would it even be useful at all?"
Lately I have been asking myself, do I really want to optimize every last dollar of my PF? If I pay some more to the tax man due to RMD's/SS txs (while enjoying a robust retirement) shouldn't I be spending my time on the things that make retirement/life worthwhile? Counting every last nickel in the PF isn't one of them. Just some thoughts I've been pondering lately...