He headed things during the Xbox 360 era, which was a golden era of gaming, one of the best console generations and also peak Xbox.
Just look at this video to get an idea of how high the density of great games was at that time: https://youtu.be/w5u8jyPIrIY?is=NsTee0620BmmVbcB
Wikipedia doesn’t show him in an ‘overall leader’ role until 2014, a year into the relatively disastrous Xbox One era.
https://en.wikipedia.org/wiki/Phil_Spencer_(business_executi...
IIRC Xbox had been criticized for quite a while at that point for having very few exclusive/first-party games worth buying an Xbox for. I always assumed this move was to try and fix that problem.
So you end up with this schizophrenic way that XBox became more of a publisher than a console brand, with a leadership used to cross platform (Sarah Bond), thus ‘everything’s an Xbox’ pivot for the "curve must always go up".
To be fair to Phil Spencer, this was the strategy across the industry right after COVID. Remember the shopping spree Embracer Group went on between 2020 and 2022? I think we were in an e-sports & live service bubble that has now popped.