It is a disservice to advocate for the separation of scoring and pp. They should be very interrelated. In particular, a higher score should always mean more pp. The current implementation is silly. There are many forum posts asking why people lost pp after improving their score. Most of the time the response is to chastise them for not searching before asking such a common question.
Many of these people will be players just starting to be invested enough in osu! to pay attention to ranking. According to Peppy, one of the major goals of the pp overhaul was to encourage progression, but the current system runs counter to that. After you set a decent score on a map, it is in your interest to actually not play that map again until you have improved significantly. Otherwise, you risk disappointment after a few missteps on on otherwise excellent play (for you) leave you a few thousand ranks below your starting point. This does not encourage to keep people playing osu! and fixing it should be made more of a priority.
Many of these people will be players just starting to be invested enough in osu! to pay attention to ranking. According to Peppy, one of the major goals of the pp overhaul was to encourage progression, but the current system runs counter to that. After you set a decent score on a map, it is in your interest to actually not play that map again until you have improved significantly. Otherwise, you risk disappointment after a few missteps on on otherwise excellent play (for you) leave you a few thousand ranks below your starting point. This does not encourage to keep people playing osu! and fixing it should be made more of a priority.