We have high resolution, LEO satellites that are preferable.
Just this week we had a (slow flying) spy airplane land in Russia. For some reason, there is apparently still a need to use airplanes too.
Preferable, except that it’s hard to schedule a satellite pass over an arbitrary point of interest.
They cannot be sent where they are needed. Their utility is limited based on the dynamics of their orbits.
They are stuck with the sensor suite they have at launch. You cannot change the sensors based on the mission needs.
Other than that, they are a perfect replacement for the SR-71.
All of those puppies have predictable orbits. That being said, the U-2 does the pinch hitting because it isn’t so expensive to operate and maintain.