You will always have numpties who cannot find the AUTO setting on the light stalk that most cars seem to be equipped with these days….
DRLs DO help improve the safety on our roads, so if you have it, best to run it.
I honestly don't understand the logic that for the sake of a few quid every 4-5 years that these bulbs tend to last that people choose to turn them off or don't bother replacing them when they fail.
From 2011 all cars must have them in the EU, and that includes the UK. If your car is 2011 or later and they are turned off and the MOT technician does not fail your car, then he has made an error.
And if you ever drive on the continent, in most EU countries you have to have either dipped beam (higher power consumption hence fuel usage) or DRL active in daylight hours. In the UK that does not seem to apply. Instead we get numpties with their sidelights on and fogs as a dipped beam replacement in pitch black dark.
We need some more driver education, and coppers willing to stop offending drivers.