We've had DRL in Canada for 30 years & it's been in Sweden almost 50... huge reduction in collisions almost instantly on introduction, and no sign of fade-out with saturation.
Transport Canada has finally recognised a problem that came bout 10 years ago - the digital dashboard lit up like a Christmas tree, DRL on, and not a rear marker light to be seen because the nut on the steering wheel never pulled on the switch to put a new wick in the taillamps.
2020 in Canada, DRL includes ALL running lights.