Qubes is very useable for day-to-day computing (though, being a linux desktop, might not be for everyone). It's just not a good fit for your usecase, because it includes gaming. I wouldn't hold my breath for this to change anytime soon. There are good reasons why the qubes GUI protocol is implemented the way it is, it's to keep untrusted data processing in dom0 to a minimum.
Qubes OS is very useable, as long as you don't need 3D acceleration. My solution to this is to have a seperate gaming PC that's completely untrusted.
The Qubes devs will not sacrifice the fundamental security properties of the system in the way you suggest to better service gamers.
That would be a valid argument 10-15 years ago however today you need 3D acceleration for (MS) Office.
Running YouTube at anything above 720p is difficult, 60fps isn't functional same goes for 1440/2160p.
Other applications like graphical applications, video editing, CAD etc are also non functional.
I don't know why have you brought up gaming I never did, but please don't even attempt to deny the fact that 3D acceleration is required for many many day to day use cases today that have nothing to do with gaming.
If you use MS Office for work, if you do any sort of content creation, and if you just want to enjoy HD media QubesOS is not for you and those aren't some edge cases.
Yes if you only use VIM ,Libre Doc's (And even Libre Office is using OpenCL these days for spreadsheets and many other things) and Gmail you can use QubesOS without any restrictions but if you need other thinks like for example even basic 3D modeling/slicing software for your 3D printer, Sketchup or Ligthroom well then sorry my dear.
OK - I will deny it, just by the simple fact that for the last 6 months I have used Qubes exclusively, including daily use of MS Office 2013 (and more recently Office 2016) for work within a Windows 7 HVM (I have not opted to use the Qubes Windows tools yet). The experience has been entirely satisfactory, and I have not regretted it. I assume that if Office does make use of DirectX, there is a software rendering pipeline fallback that works fine (but perhaps not at 200 fps). For convenience, I have also used Inkscape and Gimp - other content creation software, I suppose - within the Windows HVM session without any problems. At one point, I even made use of a professional level parametric CAD software package within an HVM session - it worked, even if admittedly it would had some fancier rendering options available with a dedicated GPU.
Your complaints about lack of 3D acceleration seem to reflect your personal preferences, and are not an actual requirement for making use of MS Office or many other software packages. My six months of production level use provides simple proof by existence. There are some things - games included - that do need something like GPU passthrough, but your view of the situation is either outdated or simply wrong.
Qubes OS is very useable, as long as you don't need 3D acceleration. My solution to this is to have a seperate gaming PC that's completely untrusted.
The Qubes devs will not sacrifice the fundamental security properties of the system in the way you suggest to better service gamers.