He may have left because he will now be writing less. He has mentioned that.

"I will be averaging 50 posts per yearfar fewer than the 200 or so posts per year Ive been doing for Category 6, but enough to keep my voice out there."

I do wonder if it has to do with how the Weather Underground has gone downhill over the years. Parts of the site simply don't work (individual international radar sites in Canada and Australia) and others have varying issues. You can't zoom in very well in the U.S. NEXRAD display for individual radar sites. For years they haven't had the storm tracks table that they used to have which had information about labeled storm tracks on a radar image.

The Wundermap display isn't as good as it used to be, though that was in part due to switching from Google Maps I think. They have made improvements to it though since the switch.

But in general, The Weather Company buying the Weather Underground made the site worse.

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As for the article limit at Scientific American, you can bypass that by viewing it in a private browsing window. You can get away with that on some sites.

As for sites that prevent you from using a private browsing window, you can always turn off JavaScript. You won't get videos and maybe even some images, but you can read articles.

Click the icon to the left of the link. Then when the menu pops up, click "Site settings". In the new window you will see an option in the list to block JavaScript. Once you do, the option to allow it again will be in that original popup menu too.

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I like details on the radar imagery. I don't like that many of the sites are going with rounded imagery. I want all the data. I don't need them to make the radar imagery "pretty". I'm not looking at the radar to see nice rounded edges and a small subset of colors. I want to know how intense the returns are and I want as much detail that I can get. They can have both options.

Weather Underground still has the option to smooth imagery on their NEXRAD display.

But compare the NEXRAD display (at left) to the Wundermap display (right), both at Weather Underground:

That's nearly the same imagery, within around a minute or two of each other. To the right is what a lot of sites are doing. I don't want that. That tells me very little. There's a heck of a lot of other detail in the display to the left. If all sites do this, and the only way to get the full detail is to pay for some app with it, it's going to make people less safe.

It seems like they might be phasing out the NEXRAD display based on people complaining about some of the issues with the display and Weather Underground not fixing them.

NOAA has had detailed imagery, though when you zoom in it doesn't retrieve even better imagery like Weather Underground does on their NEXAD display. But at least it still has had the full detail, not the smoother imagery.

This site has some okay data for radar:
https://weather.cod.edu/satrad/
Though it doesn't have city labels and you can't zoom in.

Individual radar sites can be found here:
https://weather.cod.edu/satrad/nexrad/

It just seems that while other stuff improves, radar data and options to view it aren't as good as they used to be a decade ago. At least freely.