Hi,
Please stop removing dates from descriptions, they are many times useful to separate different honomyms or to help identifying a person. Contributors took of their time to add those informations, removing them is not respectful of their work and I personally consider it is a deterioration
Can you provide the homonyms for these persons ? thanks. You can also see Help:Description
Pierre Bonnaud has already several homonyms.
However, with time the database will grow and it many new homonyms may appear. Removing dates mechanically like you are doing it doesn't bring anything, it can provide no benefice. There is nothing in the help page that supports what you are doing. Bad descriptions are too long or too vague to characterize properly the items.
with the description, you can remove the homonymy. Nothing is written in the help pages to systematically add dates, you can ask for a vote in this sense but you will have difficulty imposing it. Many tools use the description and are based on the fact, there is no pollution.
There is no obligation, but it's obvious it's a condensed and pertinent information about human being to know about their lifescope (or year of birth when the person is still alive), and by removing it systematically like you are doing it cannot be helpful, in any circonstance, this can only cause trouble. I don't understand why you are talking about pollution and facts, this is obviously a fact and no pollution. I have already lost a lot of time trying to find a good homonym because dates were missing, it depends on the data one is handling, having the dates directly can be very helpful in some cases. Also, you cannot reason from a static current situation, the database is dynamic and new items are added constantly, so it's also better not to have to lose time to desambiguate constantly the item's descriptions.
You are in an object database where you already have the information and all these unnecessary and undesirable additions serve no purpose except for perfect homonyms: name+description. This almost never happens except for sovereigns. That's why it's not written in the online help. If you go to matchid, you will see that it is highly undesirable to add this wording, and the same applies to places of birth and death. I don't see why you want to go against all the accepted rules, but you could at least ask for a community vote before changing them.
As a contributor to the database I am frequently annoyed with description that provide not enough informations (typically "... writer" or "... journalist"), and the dates are decisive to separate homonyms without needing to check details inside the page itself (and even though, it's not always easy on some ones). Also, I don't understand why you pretend it goes all the accepted rules, this is juste your interpretation: the help page you refered to above gives singer Madonna as an example, and the description gives her year of birth.
OK, you don't understand what an object database is and more generally what wikidata is. Please refer to Help talk:Description/fr, someone else can explain it to you