The process matters a whole lot. You can see this with 14nm vs 10nm Intel chips and their power characteristics. The Zen3 core is excellent but if they were for

The process matters a whole lot. You can see this with 14nm vs 10nm Intel chips and their power characteristics. The Zen3 core is excellent but if they were forced to use 14nm it would be far less competitive in terms of core count, cache, power, and max clock rate.