Valve completely overhauled the hero ban system in Dota 2 patch 7.35d

Valve removed the ability to ban heroes during picks in patch 7.35d, and now the system works completely differently. Players can now ban four heroes of their choice before the match even begins.
The developers announced these changes on the official Dota 2 website.
Now, right in the main menu, players can choose four heroes they do not want to encounter in their matches. It's worth noting that the list is not final and can be modified an unlimited number of times.
Starting from the release of patch 7.35d, there will be no bans during picks unless the developers decide to reintroduce this system in a future Dota 2 update.
Recall that Valve released patch 7.35d for Dota 2, which not only included gameplay tweaks but also added several new features to the game.