Yeah, I have to agree with the above comment by rdennison. There are so many SRS services out there already (and most of them offer a better SRS system and/or better features than the Bunpro one) that spending time on expanding the Bunpro system isn’t worth pursuing immediately. That is how I feel as a user, anyway. Maybe from a business perspective it is worth doing but…
I use JPDB for vocab (and it can be used for kanji although I use the excellent Kanji Study app on Android for that) and, despite having issues, it is miles ahead of the Bunpro vocab SRS system. I don’t use Anki but, equally, it is insanely versatile and pretty much does everything you might want it to do.
I would want to see time and effort spent on improving the grammar side of Bunpro rather than anything else. I guess this is personal opinion only and, again, if there are compelling financial reasons to not do that then I understand. But I I don’t think I would recommend a beginner to use the Bunpro system for vocab.
Sorry this is a slight derail on the thread topic so to keep it as relevant as possible I will say that people should check out JPDB for vocab if you don’t like Anki.