The Frauchiger-Renner result can be seen fairly easily. The argument has Alice and Bob making measurements of their friends in a lab. The friends of Alice and Bob have needle states entangled with the quantum states. Alice and Bob in observing the needle states of their friends is a further entanglement. However, if Alice and Bob compare notes either there is a collapse, which means a decoherence that "demolishes" the quantum wave, or this comparison is a form of entanglement swap done in teleportation. In this second case we have a continuity of quantum physics, but without the classical transmission there is uncertainty whether Alice and Bob have commensurate outcomes.
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