For me, the electricity bill is first (maintaining 400W would also be too expensive) and at most 37 dB is second. I will undervolt and -clock for sure but the default TDP must be low enough to start from. Efficiency could enable both and at least 3080 speed.
From Samsung 8nm to TSMC 4nm is supposed to increase efficiency by roughly 1.6x. Even just porting 3080 to the smaller node could greatly increase speed at 320W, reduce 320W to roughly 200W or a enable a modest combination of both. I am at a loss to understand why apparently Nvidia chases AMD to let 4080 have ca. 420W and 4070 ca. 300W according to currently rumours instead of simply decreasing TDP and / or moderately increasing speed.
I would happily buy an RTX 3080 Super that would simply port 3080 to TSMC 4 nm, maintain 3080 speed and have roughly 200W. Maybe there will at least be a 4070 Laptop with close to 3080 Desktop speed at, say, 110W.