I like your planning focus on garden goals and think it works very well for those who are in the early stages of building their gardens when research and planning are crucial.
However, I have nearly achieved my main goals in my garden, so most of what I do now is maintenance and puttering. The exception is plant removal or replacement, which doesn't occur very much as my original plant choices have worked out very well.
My approach these days is to use a seasonal calendar.
Because I do not want to be doing much of anything during the hottest part of the summer, and I want the garden to be interesting but not cost too much to maintain, I've chosen natives, near natives, xeric and near xeric plants with only a few notable exceptions such as a hydrangea, some roses, and a few clematis.
My calendar lists general times for pruning, deadheading, fertilizing, and watering various plants. The system for watering changes somewhat during the year, esp. if we are forced to ration water, but it seems to be working well.
It is easy, if one is goal oriented, to become so focused on planning and execution that one forgets to appreciate the purpose of all the work. As I age, I find I am enjoying the results of earlier planning and execution much more than I am the planning or execution itself.