IF you want to learn a lot about investing I think this is a great approach, similar to what I did. But it is work to be efficient, so if you don't want to be that involved you're at a stage that VTI or VT are fine for everything (unless you are very averse to volatility, at which point you could pick a suitable Vanguard Lifestrategy fund to put everything into with a volatility you can stomach).
What's funny is after 20 years, I learned a lot of things that I apply to a lot of financial areas in some complex ways, incl. tax, etc, but for investment allocation/re-balancing specifically I ended up simplifying greatly over time, and am not that far off from just having everything in Vanguard LifeStrategy growth.