I would argue it’s still mysterious. If it were simple, we wouldn’t have what’s called the measurement problem.
Also, there is more than one way to measure something, and not all of them require a real photon to hit some particle. In the Elitzur–Vaidman bomb tester, you can “measure” whether the quantum bomb’s sensor is working or not without actually hitting it with a photon. Instead, you hit it with the “chance” of a photon hitting it, and that’s good enough. (It’ll still blow up half of the time, but you can design the tester with multiple recursive tiers to increase your tested-but-unexploded bomb yield to arbitrarily close to 100%.)
I would argue it’s still mysterious. If it were simple, we wouldn’t have what’s called the measurement problem.
Also, there is more than one way to measure something, and not all of them require a real photon to hit some particle. In the Elitzur–Vaidman bomb tester, you can “measure” whether the quantum bomb’s sensor is working or not without actually hitting it with a photon. Instead, you hit it with the “chance” of a photon hitting it, and that’s good enough. (It’ll still blow up half of the time, but you can design the tester with multiple recursive tiers to increase your tested-but-unexploded bomb yield to arbitrarily close to 100%.)
That’s pretty mysterious in my mind.
It is absolutely still extremely mysterious.