you're not wrong; it's definitely a tradeoff. different points along the continuum of new features vs compatibility will make sense for different products.

imagine a word processor that made breaking changes to its file format every year. there's no new feature that could be worth that amount of hassle in 2020. in markets that are still changing rapidly, it's okay to be more aggressive with phasing out support for older versions. from my perspective, the desktop OS is already mature. more than anything else, I just want it to not break things that already work.