Things could get better with new generation of Imagination GPU’s as it’s almost efficient like next gen A6xx, the rest they compensate with better drivers & now they are more available to Chinese (as they both them) and Asian in general vendors but we will see about that. Snapdragon 660: Helio P70: Brand: Qualcomm: MediaTek: Fabrication Node: Samsung’s 14nm LPP FinFET: TSMC’s 12nm FinFET: Core Configuration: 4x Kryo 260 (Cortex-A73) + 4x Kryo 260 (Cortex-A53) 4x Cortex-A73 + 4x Cortex-A53: Max Clock Speed: 2.2 GHz: 2.1 GHz: GPU: Adreno 512: Mali-G72 MP3: AI Support: Yes, via Qualcomm AI Engine: Multi-Core AI. Thing is high end Snapdragon 635 goes to 3.2~3.6 W wile competition uses almost twice as much. Fair exception would be S625 wile it’s newer variants S630 cross that border. The mid-range bracket is murkier though, as MediaTek’s Helio P60/P70 and Qualcomm’s popular Snapdragon 660 are similarly powerful, though Qualcomm’s newest 600-series chips blow the Helio.
So at the end most even midrange SoC’s get over 3~3.5W top (GPU+CPU), while sustainable is around 2.5 W. Their is no silicone (SoC) for general use disregarding of vendor that comes even close to “ideal” or even good balanced use as all of them priorities frequencies over power consumption. ARM POP is also behind 3rd 4th pass pre rooting from QC but by the nature of things (as CPU’s are far smaller than GPU) I will say that’s less significant. The current gen Adreno’s are almost twice power efficient compared to current gen Mali (G72). Well your “ideal” is probably to far behind for me.
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