I still search if something could replace P900 for me since i´m scared that it will not work one day. Good news that it still runs on macOS Catalina without any update for a long time.
There is still something with the included effects and (polyphonic) saturation which is even without any oversampling (but you also can use 2X, 4X or 8X if your cpu can handle it) more musical and full of "happy accidents" i get with no other software synth. Only which comes close sometimes are Repro, Moog Model D app and maybe Dune 3 but still not like P900.
I just love the gnarly and also soft timbres i can get out of it from the same presets just doing a few tweaks and connections.
F.e. these are mainly all tweaked from the same presets (my own default) and tweaked within a minute or so.
And a nice saturated analog acid arp from P900 (plus some extra external FX like Precedence and Replika-XT and a simple beat to go along while tweaking the preset a bit on the fly).