In addition to what others have said here and elsewhere, I think some of it is also internal competition gone too far among mechanical designers to make the thinnest edge or the most subtle bezel. When I worked with product designers in the past, there was always a lot of oohing and ahhing whenever they'd come across a competing product with tighter tolerances than they'd seen before. Its like the product design version of needing to use the latest pre-alpha NodeJS framework or transpiled front-end language; it doesn't necessarily have a direct effect on the end user experience, but it satiates its creators own need for new and shiny.