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 use

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.