Don't think its so much the drls causing it, just think some newer cars in general have changed the way dashs are, one of Mrs' cars (10 plate Astra sri) the dashboard was lit up with engine on and had no drls, when turned lights on, the dashboard dimmed. Same with her Mazda now, it's always lit and dims with the lights on. Which has drls.
Thing is as well tho, drls are brighter than sidelights, sovshdn driving at night increases risk of dazzling other drivers, could be a double whammy if get caught...