Photoshop's blur tool is not strong enough for remotely high resolution projects

If I'm working in a project that matches the resolution of any image that I capture, the blur tool does almost nothing.   Its only useful in projects that are maybe 1K-2K wide.   It's a very useful tool in smaller canvas projects.  Hundreds of people have reported this frustrating limitation in forums, but the tool has never appearently changed.  Some people say you can simply create a blured layer and brush it in, but this is not the same function and does not produce the desired results.  That's just fading in the opacity of another layer with a fixed blue ammount, and this causes a kind of double image or composit of two very different layers.  The blur tool can increase the ammount of blur incrimentally with each stroke, allowing you to blend sharp objects with their backgrounds to the exact degree you need.  This is my number one hope for each photoshop update.  I hope you can impliment it someday.

Thanks,

TJ