A probably more realistic 'fix' for this would be a browser extension that could strip media queries out of all websites' css, below a certain threshold (eg, 600px)
The reasoning for this is fairly simple: a majority of users visit the site on mobile devices. Sites are being developed with a single code base for the largest group of visitors, with tablet and desktop users being added on afterward almost as alternative views. Using this process doesn't always produce the best results for any browser size because it requires a design plan that considers the requirements of this method.
Desktop-only sizes and features are great add-ons if you have time. But being able to get MVP to 100% of users is the top priority.
It seems it may not be quite as simple as I described, but you could probably spoof the device width being sent to the web page