Have you tried reading this thread before calling something "dumb"? Of course the creation date idea was considered and it was shortly dismissed because it's not compatible with OSM inner workings.

OSM doesn't have stable entities, someone can add a shop as a node, and someone else can transform it into an area or a relation, which will make it a completely separate entity with a new creation date. It just not reliable enough.

The date of the latest edit is even worse, since it can be an automated edit and there is no reason to assume that all the tags were checked. Which leaves the only sensible option: manual history check in order to determine the most likely check date. It can be creation date, but it can also be any other date, you can't tell without checking full history. A place can be created 10 years ago with a single tag such as street name, with the rest of the tags added a week ago. Of course, we'd like to find an automated and bulletproof way to figure out the check date, but it's clearly impossible.

This timestamping activity was a one-time thing aimed to help local editors highlight the most problematic/outdated places for further re-verification. It's one of the many measures aimed at boosting the data quality and reliability.

I noticed a clear pattern of harassment and erasure of other people's contributions coming from your account. I prefer not to involve the admins since they have better things to do, but I will be forced to report it if this doesn't stop. I'm happy to answer all the questions, as I did many times with many other users, but let's keep it civil.