I have never spent a dime buying a MS product (directly) but they definitely don't "just work" based on my experience with my work computer. Windows is awfully slow, Office and Teams are sometimes just unusable because they take so much memory on my machine and keep freezing randomly. I do agree that MS used to be the company where products just worked (windows 95, 98, office 2003 and prior, hotmail etc.), but these days pretty much all MS products are awful.