Blender's user interface (UI) was very polarizing in the past. Older versions of Blender required the user to memorize dozens of hotkeys before it was possible to accomplish even basic tasks, which meant that many users found this hard to use. However, those were the days of Blender 2.49, and when Blender was updated to version 2.50, the UI got its first major facelift, which added many new features, more buttons, and a cleaner user experience.
Each release of Blender increments the version number by +0.01, which means 2.80 is 30 versions newer than 2.50 – that's a lot of versions! Many of these versions simply added small new features and bug fixes, but version 2.80 is just as big of an overhaul ...