HP/UHP (high-pressure/ultra-high-pressure) metamorphism requires subduction of relatively cold crustal material to great depths without melting, which is only achievable under the cooler geothermal gradients of modern-style plate tectonics.
In the Archean and earlier, mantle and crustal geothermal gradients were significantly hotter than today, so subducting slabs would heat up and melt or weaken...
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