I dont know anything about faucets other than using them. But not all faucets are the same. The mechanism, the design tolerances, the materials, the granularity, smoothness and its longevity can vary by a lot.
Grohe used to be amazing, i am not so sure how things are nowadays. I've heard enshitification has hit them. If you own a house, a faucet is something that you will use for decades, even centuries(your descendants). Something that you will interact with many times a day. It is worth spending a bit more money to get something good.
Yes, the F-35 is so bad that literally every single allied country is ordering and is willing to wait for like 5+ years just to receive it. It is the best selling aircraft out there, with insane capabilities for its price. America cant produce these things fast enough.
https://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning_II#Operators
More than 20 allied countries have bought/ordered it and in significant numbers. It is going to be the future backbone of the airforce of most of those countries. Just because it had issues, doesnt mean that it isnt good or that many of its serious issues havent been resolved.
Also the F-35 has built-in networking and infrastructure to work as a mothership for "drones" or other remote controlled/ai platforms.