I don’t appear to be suffering the same problems as many. I use a mix of devices.
On 2 windows laptops (one W8, the other W10) and using Chrome, the desktop site doesn’t appear very different than 2 days ago.
On mobile devices – Chrome on Android the mobile version generally OK (the variability in text sizes a little odd); and on my iPad2 it seems to work – I am certainly not getting the issues that many have raised.
I’m not a Premium member, so don’t think that has an impact.
However I have never posted from a mobile device, so not idea if that experience has changed (for many, it would appear so)