If you are not even going to bother writing them up properly, no one is going to care. Seems fair to me.

You don’t have to make a ”paper” out of it, maybe make blog post or whatever if that is more your style. Maybe upload a pdf to arxiv.

Half the job in science is informing (or convincing) everyone else about what you made and why it is significant. That’s what conferences try to facilitate, but if you don’t want to do that, feel free to do the ”advertising” some other way.

Complaining about journals being selective is just a lazy excuse for not publishing anything to help others. Sure the system sucks, but then you can just publish some other way. For example, ask other people who understand your work to ”peer review” your blog posts.