Yep, even "efficiency" cores are a scam. They were forced to go that way because their current process simply can't support all full cores without drawing 300W+ and taking too much space.
Cut down E-Cores aren't even efficient power wise, just space efficient so they could fit them on the die.
Besides power consumption my trust for Intel is down the gutter with half a dozen security issues. Which were patched with performance degradation. So they fucked up, patched it in software, now your hardware runs slower than when you bought it.