>It has been designed and commissioned by people who believe that "most advanced" necessarily means "best" and who are indifferent to the actual tactical and strategic requirements.
They said the exact same thing about the F-15. And the F-18. Both of which went on to spectacular success - the F-15 in particular has never once been bested in air to air combat, while claiming 105 enemy kills (including MiG-29s). It's able to do that due to its big sexy radar and complicated electronics and all the other techno-gadgets that people like Pierre Sprey decried every step of the way because he still thinks we live in 1967.
On the ground, there is less room for innovation. Guns are a mature technology. The primary concern in 2019 are things like reliability and cost, because the difference between an AK47 and an M16 is not that big. They both shoot bullets, they both are capable of full-auto, they both are light. To the soldier holding them, big difference of course - but from the 10,000 mile perspective they're basically doing the same job in the same way. It doesn't make much difference if I'm a general planning strategies whether my rifleman are holding M4s or M16s or AK47s.
Air combat is different, technology is still radically changing things every generation. And if you're caught a generation behind it's hard to make a fight of it. We have jet engines, and our enemies don't. We have solid state avionics, our enemies don't. We have AESA radar, our enemies don't. And now? We have all those advanced technologies in the F-35, like production line stealth, that no other peer enemy yet has deployed on the field. Certainly technology is not everything, you also need training, tactics, support systems. But it is undeniably a massive advantage, and one that's worth a little teething to get.
>The Army and Marines have been crying out for years for a suitable replacement for the ageing A-10. It's the finest close support aircraft ever made, it has a legendary reputation among infantrymen who served in Afghanistan and Iraq, but the USAF are still planning on retiring it in favour of the F-35, an aircraft that is simply incapable of performing the same role. Even if the F-35 were inarguably an excellent aircraft, it's the wrong aircraft for a vitally important job.
The A-10 is a really awful CAS platform. It's ungodly slow and so takes forever to get on station, the cannon is horrendously inaccurate, it's got a low mission capability rating and the entire concept of its design (low-flying ruggedness) was rendered obsolete with the invention of the manpad. I mean this is the platform that flew the least number of CAS missions of any capable airframe in Iraq 2, yet had the highest number of friendly fire incidents in absolute terms. If you're curious how, the cannon. All the other platforms are using fancy sensors and PGMs, while the A-10 is often going on gun runs with the Mk-1 human eye. The A-10's only two numerical advantages are loiter time and cost per flight hour, but drones exist now so it doesn't even have those unique positives anymore.
The fact that soldiers love the A-10 is meaningless - sailors loved battleships too, even after they were turned into big metal deathtraps by airplanes. The troops just really like giant cannons, even when they're not actually useful anymore.
>Servicemen don't want cutting-edge innovation - they want weapons systems that work reliably in the field and provide useful combat capabilities.
Soviet jets could handle pebbles being blown into their air in takes. They could handle smacking down onto the tarmarc at a velocity that would cripple any modern American jet. They could be nearly shaken apart, but were just built so robustly they'd still make it home. Comparatively American jets were fragile prima donnas who needed huge amounts of maintenance and could only be flown on the most pristine of air fields.
But once they were in the air? USAF planes showed exactly why all that TLC were more than worth it. I'd rather be sitting in an F-15 than any Soviet fighter ever put in the sky. At the risk of repeating myself, the ground pounder ideology of "rugged, reliable, lowest-possible-tech" is suicide in the air. In the air, technology advantages still play a huge role and so suffering a low mission capability rating is quite possibly worth it if you get a massive return on power (within reason of course).