While being more opaque & difficult to self-correct for. How much more work are we talking about? A theoretical couple of minutes in a year? Not worth it.
Using the scheduler estimates from the FSRS simulator [1], for desired retention held equal at 85%, I received approximately 20-30% improvements in workload upon switching to FSRS from SM-2. Even disregarding the "internal" improvements, the ability to reduce the number of parameters that require modification/present risk to performant scheduling is heavily reduced to only setting desired retention explicitly (a benefit in and of itself) as well as minor decisions (e.g. inclusion of suspended cards). Interpretability really is far less of an issue than efficiency, and frankly the achievements of the team behind FSRS (including their decision to make it publicly available) should be lauded.
