Kamikaze
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Let's assume we calculate the rating based on activity in Heroes 3. There's a player who played only one game and ended up in the top positions, earning 100 points, and he doesn't play and doesn't plan to. Even Dmitry AS will hardly surpass him in this rating. If you're going to reset all ratings next year, it still won't be easier for Dmitry AS this year :) because, in the end, he loses points in the final rating, precisely because he was more active. Kamikaze, can you say something about this in your system?
In my opinion, simple summation better reflects activity. And if a player is very active, he can certainly surpass Dmitry AS, if the latter plays only once and gets 100 points. But who will be to blame in this case - AS, for not playing actively? In your version, an active player has a higher chance of losing to an inactive player (who just got lucky once).