Some of that is building "mobile-first". If every app needs to be easy to use on small screens with big touch targets first/foremost/always, then anything that takes time to develop and only makes sense for a demographic "desktop users with an ultrawide and effectively all the screen space in the world" gets deprioritized simply because it's a smaller audience; no real malice intended in such cases just over-prioritizing the "needs of the many" over "the desires of a privileged few".