How is it half baked?
Sure: if you know Linux well enough, AND YOU SPEND ENOUGH TIME ON YOUR SYSTEM, you can fix most of the above issues (I could not fix the Gnome DE latency with hidpi, btw). But I don't want to waste my time fixing my desktop; I want to pay, and my desktop should just work.
Then: if you like the Linux desktop, feel free to use it.
I don't expect you to get back on Linux or anything, but paying for known supported hardware (e.g. Dell XPS 13) goes a long way to have a 'no-tinkering-needed' experience (pretty much like OSX run better on its own hardware).
For the record, HiDPI works flawlessly and responsively with a Dell Precision 5510, including when using projectors with different resolutions. Never had an issue with my Bluetooth headphones, and the system does include a braindead, just-works backup-and-restore system : deja-dup, which works with Google Drive out of the box after inputing your credentials.
Applications that don't have a Linux version can be a pain, but most have perfectly good alternative (Google Docs, Flux, Zeal for Dash).
Some of them don't really, or require a big change (typically, Photoshop/Gimp), and those can indeed require one to stay on a specific OS