cz they didn't have gamers in charge but your MBA kind / seasoned execs like Phil Spencer.
I bet you - if they had people like Facepunch [running independent studios] - then yeah Xbox would've been successful (they kinda already are, but fucked themselves over due to an incoherent strategy)
Unlike - Xbox - Nintendo have an identity. Fun games first, graphics second. Xbox had an identify before - multiplayer/ live games. but now who knows what they're.
[0]: Facepunch - https://en.wikipedia.org/wiki/Facepunch_Studios