Yeah Ukraine isn't working with the best tech; it's a doctrine of desperation rather than preparation. But they discovered something effective and it will change the way wars are fought in the future.
They didn't really. TOW's are a thing from the 70s. They are essentially the same thing, but instead of electric rotors they are using a rocket motor. Switchblades existed before this conflict too, if loitering is the measure we are going with.
It's a hacked together solution to a real problem they are having, lack of artillery shells and more reliable munitions. And well done to them.
But a country with the benefit of time and deep pockets is going to come up with more reliable, more effective solutions.
We are seeing the Russians turn to drones as well, but they also burnt their stockpiles of other weapons and are in an emergency too. And additionally they have also doubled their artillery shell production.
If you fire it at a guy or a vehicle, you either going to hit very fast or miss very fast.