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Max speed is different than cruise speed. Mig 25 doesn't cruise at mach 3, or even 2.8. It has to kick in the afterburners and dump fuel in exchange for dash speed.
SR-71 is different than any other military plane in this regard. It CRUISES at mach 3+. It can sustain that speed for as long as it has fuel and not damage the plane.
Mig 25 is an amazing piece of machine given its crude technology and how fast it was developed.
SR-71 is an absolute masterpiece of engineering, the likes of which may not be duplicated given the secretive nature and how fast those revolutionary technologies were literally invented overnight.
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