Unfortunately I have no way of knowing that the dt defaults are for the entities we are discussing: they are no defined in the user manual. I also fail to understand what benefit a user calibration of my monitor and the creation of a color profile for it would have over the manufacturer created .icm, for the use-case of “people who will see your images on screen will know nothing about colour accuracy (nor care about it).” - which caters for, essentially, 100% of my images.
I will get around to doing this, though, just to see if I can discern any difference in the way images appear after I have mastered the art of calibration and profile creation using my Datcolor Spyder. On current progress that should be well before the heat death of the universe.
In the meantime, spookily, my images have not appeared, in the absence of this calibration, to be the veritable spawn of the devil himself - as I was warned they would be by just about every article I have read on monitor calibration (especially those by the calibration hardware manufacturers. Now, I wonder why that is?).