Um, maybe because every pro app that apple has brought to the market has been a killer app! It’s not about apple fanboyism… its about a track record.
Apple bought Shake. Shake was the driving force behind many studios and oscars.
Apple purchased and developed all the Final Cut Studio software. All industry standard killer apps.
Apple Logic… most talked about and used app in the music industry as far as I know.
Apple Aperture… almost a first of its kind that gave Adobe a quick run for their money. Now Aperture vs Lightroom is debatable but its still a solid killer app in the pro industry.
So I’m not saying that there aren’t programs that can hold their own and people love just as much such as Nuke, Adobe Products, etc but Apple has earned their spot for people like me to assume… the next pro app they develop will be just as good.