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To some extent brain "power" goes with surface area, right? Granted the surface is highly folded in 3 dimensions. But I think larger brains have a lot more "non thinking" matter to support the complexity of maintaining a larger neural network. On the other hand, effective thinking-power may be superlinear in neuron count. Or perhaps sublinear.

Birds are on a better process.

Maybe cooling is also a factor, so we are constrained by our brain's surface area.

When talking about brain power like this, I don't often see people mention the costs of simply driving a more complicated body. Birds are physically simpler than humans (no hands, fairly simple feet/legs) so maybe they just spend less overhead on motor skills and associated control?

Recently finished an interesting survey of bird intelligence (speech, navigation, social order, etc.): https://www.jenniferackermanauthor.com/genius-ofbirds