Why don't the same capabilities for managing value-based symbology exist for raster datasets the way they do for vector datasets? This is in 2.9
For instance, if you have a vector dataset symbolized on a field you can create headings and either right click and send a symbology value to an existing heading or drag it manually. Yet on a raster dataset you can symbolize on a value, specify headings, add values to new headings, but you can't add to existing headings or manually drag them (though the GUI suggests you can by displaying a line...it just doesn't actually work).
This is what's available for vector data....
...Where you can see it's possible to manipulate symbology categories.
And here's what's available for a raster dataset...
Which means that if one needs to add a new category you have to start over entirely? It seems the only option is to start with a blank slate and then grab the necessary categories and and 'add to new heading.' But if you miss one you have to start over. You also can't re-order headings on a raster dataset.
Is there a way to achieve the same functionality for addressing symbology categories for a raster dataset as one has for vector?