An experiment can be worthwhile without becoming a product. It can answer a question, reveal a constraint, or make the next attempt easier.
Keeping a short record changes how these experiments accumulate. Write down the question, the thing you tried, and what surprised you. A screenshot or a diagram is often enough to make the idea recognizable months later.
An archive of unfinished work is not a list of failures. It is a record of attention: the problems that seemed interesting enough to spend an afternoon exploring.