You still talk to other users here.
The tagline of this section is: "Share your ideas and feedback for things you'd like to see itch.io do."
And not: "Give us your feature requests here, staff will read here and discuss it with you."
You are campaigning for that feature. I get it. But asking for the feature with the ask-for-a-feature-button would not hurt your cause, now would it?
Also, convincing people that the feature would be good might help too, so they also use the feature request button.
My current opinion is, that this feature would not be as good as people envision it. And that a different feature would be better: hiding games you already know. And improving the recommendations section. Why are people complainging about tag exclusions? Imho because they use the browse filters, instead of recommendations and related games. And browse is populated with popular games, a user might not like very much. Like horror. The top games in any particular section you browse for are not changing very fast. Marking them as seen and not interested would also filter out unwanted games and might even improve the recommendations.