I don't really understand why wave-function collapse is still being taught while we seem to have better interpretations of QM available nowadays.
During the early development of quantum mechanics the measurement problem was a heavily debated topic, resulting in a general acceptance of the so-called Copenhagen interpretation. The two main problems with it are
- It is not clear what physically defines an observation.
- There is a certain faster than light interaction, thought this does not include faster than light travel of information.
Furthermore, the idea that the universe is nondeterministic was not appealing to some, for example to Einstein.
Since 1957 we have the "Many-worlds" interpretation of QM which resolves both these problems, makes QM deterministic again and gives a (IMO) much more physical interpretation. The original name Hugh Everett gave to his theory is "Correlation Interpretation" which I find actually more clear. Perhaps "Observer Entanglement" would be even more natural in the current idiom.
This theory was first mostly ignored, and even now seems to still not get the attention it deserves. Why are teachers often still teaching wave-function collapse, with all its shortcomings, when they teach QM?