Support for Gwent will end this year and Hearthstone is soon 10 years old and not that relevant for Blizzard. Their much more important game Diablo Immortal uses a different engine.
The big publishers only used that engine for a few offshoots and this change will guarantee that won't happen again.
The big publishers only used that engine for a few offshoots and this change will guarantee that won't happen again.