It doesn’t enable anything new really, @gnelson. If you want to include a script in a page in a paid app, just include that script tag in the page (edit the page object and there’s the field for that toward the bottom). I’m pretty sure that’s shown in the video posted above.
But on a free plan, that field is ignored, so LOADERR just does this for you once the page is loaded. It also has advanced/debugging applications as demonstrated in the video.
Now, loading a script (making it accessible in the page) and doing something with the script are two different things.
But for simpler libs that setup some nifty lil function(s) for you to call later (like moment or nanoid [which I show in the demo]) it’s ideal (again, in the context of hobby apps or demo apps).