Keep DSLR or go back to superzoom/bridge camera?

Grainy and out of focus is a problem, but likely not the fault of the camera.  The T6 is an entry level camera, but it is still capable of producing excellent quality photos.  The question is not about owning a DSLR, but learning which settings to use for a given situation.

Grain is most commonly caused by a high ISO value.  Do you understand how this setting effects your image quality?  Are you familiar with the various AF modes and when to use them?  There is a “triangle” of ISO, f/stop, and aperture which must be understood if you want to get really nice quality images.  Depth of field, aperture, and shutter speed can all effect the sharpness and focus.

Understanding the basics of photography and how to set up your camera are much more critical with any DSLR since, unlike many point and shoot cameras, you have to tell the camera what to do.  You can use the auto or preset modes to let the camera decide what to do, but that really defeats the whole point of owning a DSLR.

I do own a Nikon P900 “ super zoom “ and it is very useful, especially when I don't want to carry around a heavy body, and even heavier lens.  It does a very good job, but it can not duplicate the IQ of my 80D.  It's convenient, and the images are “ good enough,” but it's low light performance is very limited.

You have to learn how to use your T6 and what it needs you to do to maximize image quality.  It is definitely worth the effort.