I read a couple articles or papers where for Lithium Ion cells, keeping them between 50 and 60% was the highest longevity.
There is a Model S owner in Norway who limited the charge to 60%, never drove it below 50%, and then measured the battery capacity a year later and had no measurable loss. But keep in mind there are many factors, including battery calibration, temperature, etc.
And then there are these Japanese carbon (or carbon/lithium??) cells that have approximately the same energy density as Lithium Ion, can tolerate insanely high charge and discharge current, and have “no” measurable capacity reduction after thousands of cycles. But they are so expensive that only multimillion satellites can afford to have those cells (the payoff is worth it because “servicing a satellite” is at least tens of millions of dollars, and it is worth the extra money to extend the service life of a satellite).
In the end it’s a tradeoff; how often you want to charge vs. the cost of a SpaceBlade.
For a large battery pack which is tens of thousands of dollars (replacement cost for a Model S 100KW•h pack not known) and the realistic expectation that we aren’t driving 500kms every single day, it’s worth the hassle. But for a SpaceBlade that is $40 and will probably outlive a Tesla warranty (8 years?) it’s probably not worth the hassle and complexity of offering an option to limit the maximum charge level.