Building WiFi kernel drivers myself where on Windows its a double click, finding a desktop environment that lets you add a 2nd taskbar in the GUI without losing certain important items like the start menu, system clock, or system tray (I always lost something), finding replacements for certain niche Windows programs is frustrating (VoiceMeeter -> PipeWire), or completely absent, as my Oculus Rift and the Adobe Suite (which I need for my job) was unusable, and my Razer, Logitech, TourBox, Xence, and Elsra devices aren't programmable, missing or bad support for basic features like multiple monitors and HDR, having to manually set AppImages to run as an application and not open like a file (I know it's a file), but in the end, needing 2 GPU's to virtualize a Windows machine officially ended my Linux dreams for the near future.