Imho there is not much value in keeping that forever and it would be accaptable if some user may need to change the emedded urls. The plugin was deprecated in 2.10.0 over a year ago.
If we remove them, we should do it with a major release and I wouldn't wait for 4.0.

@sgiehl +1 to remove them but then could we note again in the developer changelog the methods removed and the new methods to use instead.

I'd add something like:

Widgets using the already removed UserSettings plugin won't work any longer. Please recreate your widget urls using DevicesDetection, Resolution or DevicePlugins plugin instead.

But should we really list all methods that had been removed a long time ago?

But should we really list all methods that had been removed a long time ago?

Yes let's list them all, as the Widget URL embed API was effectively broken it's important I feel to lay out changes we made. Ideally we'd just have to "Copy paste" the previous changelog entries where we would announce the 'url rewrites', but seems we didn't document it so far, so it will be the first time we document.