It’s a bit like saying “instead of buying food from a shop you could just grow your own food.” It’s technically true, but then you’re responsible for all the care and feeding of the tree instead of other activities that are higher economic value to you.
When we first thought of the idea, over a decade ago, people immediately raised that concern. But few of them wrote the script. Or if they did, they abandoned it after a while and it languished because they didn’t invest the time to do it nicely.
Playback of the images is the first big advantage to having someone else write the code. But also it means that someone has put effort into dealing with cases such as multiple monitors, and multiple monitors with varying DPI and so on. Avoiding screenshots when idle, avoiding duplicates etc.
But I do love scripting up personal solutions to things, and spend far too much time doing exactly that. So I like the attitude.