Why would a player choose the release over buying the game on Steam or GOG today?

The traditional "magic guild" and chance-based skill systems were replaced by a hero-based talent tree, giving players direct control over their character's growth.

The PROPHET release is a "Complete Edition," meaning it’s packed with all the post-launch content: The Full Base Game: Experience the Griffin dynasty’s epic struggle. Shades of Darkness Expansion:

The release specifically is famous because it bypasses one of the most hated features in the original Heroes VI: Ubisoft’s always-online DRM and the Conflux system.

Might and Magic Heroes VI is a turn-based strategy game that challenges players to master the art of heroism in a fantasy world. The game takes place in the world of Ashan, where the forces of light and darkness are in a state of constant conflict. Players take on the role of a hero, tasked with leading their faction to victory against their enemies.

The Complete Edition bundles the original game with all its post-launch content:

The edition features six unique factions : Haven, Necropolis, Inferno, Stronghold, Sanctuary (the Naga), and Dungeon. Technical Specifications