I think killing off Aperture was as much a strategic focusing move as anything else. Prior to developing the current Photos app (Mac and iOS share a codebase), Apple was developing and maintaining Mac iPhotos, iOS iPhotos, Aperture and the old iOS Photos app (Pictures? I don’t even remember).

Reducing it all to one cross platform codebase allowed them to make the bundled app a bit more full featured, double down on a few headline mass market features like photos sync and theoretically add more features that are missing from Aperture over time. That said, they’ll probably never duplicate it all, probably don’t want to duplicate it all and they seem to have focused more of their photography effort on iPhone computational photography. Not to mention when Aperture was first released, Pixelmator, Acorn and Lightroom didn’t exist (on the market at least) yet.

Contrast with Logic where there still isn’t a lot like it and part of how you get to be a billion dollar business is by maintaining those hundred million dollar businesses. There’s a lot more YouTubers, DJs and Podcasters out there now, not just musicians and one thing they all have in common is they’re all dealing with audio production.