I hope to eventually get to at a place of luxury to where I can be so whimsical with my creative direction. Projects for personal pleasure, exploratory nature, or high risk of abandonment may have some % chance of uncovering something unique and fruitful, but those dice rolls cost a lot of real world hours
Theres no external constraint of customer relations or motivation management in the current project juggling cycle. I adopted it because I was simply frustrated that I wasn't making progress on A when working on B, and vice versa. Now, I can quell that frustration by saying "Well, A's going to be addressed in 2 days, it's all good"
I assumed to be avoiding the penalty of task switching, I'm not well read on the topic but I assume it's more pronounced trying to do X different tasks per day, than segregating one focus per day with a sleep in between them.
That being said, your comparison of time/effort ratio is very apt. Frequently I've found myself having to temporarily halt the cycle in order to focus on cranking out one project that needed much more attention before some date. The rates of each project progression are not equal, and a simple split does not address this at all.
The fear of focusing on one project at a time instead of juggling them is that each project's completion is probably on the time scale of many months- so to neglect all other projects in favor of one- for chunks of a year at a time, seems like it would be very stress inducing.
Maybe it's a good case to consider some compromise between the extremes, something less frequent than daily switching, perhaps weekly, biweekly, or more is a more appropriate time scale to approach this with.