Not everyone cares about efficiency these days so long as the processors do what people need em to do. Intel does have TDP limited processors for OEMs, they can be run more efficiently at performance loss. However, Lakados has a point. Intel is churning out these processors on a mature 10nm node. The cost to produce these has to be low. Plus, it's all done in house. A huge cost savings.
Intel has widespread adoption. It's everywhere in every company. I have never seen someone go exclusively Team Red. AMD is gaining but for how long, no idea. They do seem to be kicking ass with their Epyc processors though. Only time will tell.
Everyone cares about performance and AMD has that belt and the efficiency belt. Ez.