Is "import theme" the only way to update/upload themes in SXA?
Well we have some great news folks, out-of-the-box SXA already has this feature! It's not been mentioned in official documentation, but it's there.
/Website/App_Config/Include/Featurefolder and remove
.disabledfrom the file named
ThemeRoot/gulp/config.jsfile as shown below.
Tip: Disable optimizer, otherwise you will have to manually delete