Icons are the first impression sighted and low enough vision folks are going to get of your app, as in before the description and reviews and everything. So if you think it could be beneficial to literally anyone who can see the screen (even if only a little bit), don't pass up the marketing opportunity.
The script definitely has potential, in fact I'm using it myself as a simple video overlay, but in your case it'd probably do more harm than good.
App icons are a matter of hiring a beginner for $20 on Upwork or Freelancer, which is really nothing in the grand scheme of things.
To actually answer your question, Pillow is the python >= 3 fork after the original PIL module was abandoned a couple years back.