It seems like the core things that Anki needs are new user experience improvements, and algorithm updates. SM2 really shows its age as compared to other algorithms.
If changing their SPS or the promises about an SPS motivate the learner, then great, they're putting in the work and time to learn, but I doubt that the effect of changing the SPS is as large as some people claim.
For example I used a tool that supposedly uses FSPS, but it did have a low maximum for the duration you don't have to practice a word, and no way for me to "ban" a word, so that it asks me in 6 months or something, and simple words kept coming back, especially after not learning for a few days. I didn't make much progress using the tool, even though it had FSPS.