[spider-mario]

> Colorimeters are physical measurement devices to adjust the display so that it reports an accurate color profile in the first place for which to color manage to.

No. You can profile an uncalibrated (unadjusted) display and the profile will be correct. There is zero inherent requirement to adjust the display, or for the display itself to report a profile.

> It's required for the monitor itself to be able to display accurate colors at all.

Also no. Once you have profiled the uncalibrated display, you can accurately display colours within its gamut by converting to the profile.