Complexity…
@ZedClampet you may be hitting on some of the most brilliant individual devs in your indie selections—in general, someone doing their own thing is naturally more gifted overall than someone working for a company.
2 things which exponentially increase product complexity are size of customer base and width of worldwide market [ie localization].
Best indie software dev I know of is your neighbor
Nick Bradbury. He developed a top-ranked product in 3 different fields, a remarkable feat in the face of serious corporate competition. He had to give it up due to near burnout from the Customer Service load.
I don't know what degree of complexity is introduced by different hardware and OS platforms, but I speculate it's considerable.
I can't see a single dev putting together the Far Cry 6 world map almost glitch-free. Then crafting the many significant NPCs, and making all the NPCs react differently depending on which gender you are and which amigo is with you.
Negotiating all the contracts for the music usage, that's gotta take some energy… then the whole multi-channel marketing campaigns…
Anyway… I suppose it mainly boils down to scope.