That is great. I myself haven't worn a motorbike helmet for over 30 years, and never been stopped or had an accident, though daily people get checked and fined for it, and lots of people die because of no helmet.
Now back on topic. The reason you have to keep it in the passport has nothing to do with a reminder, because the passport doesn't notify you on the due date, and people who don't do it online also don't receive an email.
The reason is that if (I admit rare event), your passport get checked, you can prove you did the report.