hi, while writing a comment on a subject, I am writing by considering the introduction in terms of development and result. By giving preliminary information, I actually gave you the answer you wanted. You can access the details from the algorithm link.
Think about your proposal for yourself. For example, you have 500 points and you play with 0 points player. If you get equal points when you win and lose, that kills the competition, right?
You get points according to your level and thus a controllable justice order is formed.
In fact, this existing order is valuable to protect the rights and abilities of highly rated users like you.
It is more valuable if a player with 1 gram strength can beat a player with 4 gram strength.
This is so in all areas of life. This is not a tournament area and is an unlimited area where anyone can enter the competition by creating a username.
If there was a limited order like a tournament, you might be right, but this is not possible in the disorderly environment of the competitors.