Ironically the XB-70 was also stainless steel - but it still was pretty exotic. It partly relied on compression-lift and highly corrosive fuel to cruise at Mach 3 (in 1961!).
Edit: Wikipedia diving after writing that led me to the Sukhoi T-4 which was the Russian response to the XB-70. Only a prototype, but this one was titanium and it is an amazing, drop-nose machine [3]
[1] https://en.wikipedia.org/wiki/North_American_XB-70_Valkyrie
[2] https://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-25#Backgr...
While the SR71 was more capable than the MIG, if the Air Force would've wanted to build a thousand of those in 5 years, it would've been impossible, not to mention the maintenance burden.
So while the planes you mentioned might've been more capable, in a real conflict they wouldn't have mattered much, as they could not have sustained a volume of strikes to be relevant.
Interesting how quality and quantity have changed over the years: in WW2, giant factories pumped out airplanes on endless production lines by the tens of thousands, yet those planes couldn't drop bombs accurately.
In contrast, 4th gen fighters were made in still significant volumes, and their smart bombs could hit a target accurately enough so that a hundred pound bomb can do the job you would need a WW2 B-29 to drop its entire payload for.
I think that was a peak in quality X quantity in aviation.
Yes, modern jets have even more tech, and stealth and stuff, but their complexity and and difficulty of manufacture doesn't offset the drop in volume.
So quality went up, but quantity went way down, and as a result their total effectiveness is less than the generation they're supposed to replace.
> So quality went up, but quantity went way down, and as a result their total effectiveness is less than the generation they're supposed to replace.
Not sure why you think this.
The 5th generation F-35 is a great airplane[1], and they've made 1300 of them since 2016.
The 4th F-16 (also a great plane!) had 4600 built since 1976.
[1] Yes, despite all the negative press and the amount of time it took to get right, it's a great plane. See eg https://theaviationist.com/2016/03/01/heres-what-ive-learned... where the editorializing is anti-F35 but the pilot who flew it only has positive things to say.
How many MIG-25s flew over the borders of the United States mainland during the cold war?
Yes the MIG-25 was a cheaper and more practical plane, but that wasn't the MO of the sr71.
The SR-71 couldn't be defeated by the level of missile spam that Russia was capable of, the MIG-25 couldn't get close enough to catch it and they didn't have a missile that could actually work up there. (You need more control surface up there, but down lower more control surface costs you performance.)
(And the MIG-25 was a maintenance nightmare.)
The star fighter, or f15 or f22 would be more apt.
TLDR special purpose tool vs general fighter cannot be compared
