Better? Not really. My experience is that sites have gotten “better” for mobile at the cost of making them nearly or completely unusable for people using desktop browsers with non-default settings (especially additional security lockdown, but even forcing a specific colour scheme can break some sites because some idiot calling himself a designer used css background-image for images that are content). Which means a fair number of sites are broken to some degree for me.
The more things change, the more they stay the same.
Those things are completely unrelated? I said the tools for responsive design have gotten better, which they objectively have.
You’re not wrong that most css in the wild is trash, and I love dark mode as much as the next guy but you can’t complain that sites break when you’re fucking with styles. It’s the cost of tinkering.