MS went into production later and are having supply issues. Its why your seeing the series s pop up more. They get more per wafer for each system.
Its also one of those things that MS doesn't actually care about. This year they will have Halo and a few other large game and over the next few years the flood gates will open for microsoft in terms of games. MS will be selling all they can make for a long time
After PS5 sold at higher price with scalpers everywhere. PS5 have more demand but less than the sales difference.