Binary thinking is a useful tool when done correctly. "This event happened" is a either true, or false. If it's not entirely true then we can call it false- Schrodinger's cat doesn't care the nuances, it cares about if dead or not dead.
So there's a lot of mileage to be gotten from drawing out binary decision trees rather than thinking that since most things are spectrums binaries are a trap.
I would highly encourage both of you to take a similar course if you can. Metaphysics of Identity was the name.
Sorry, missed that one due to it being an edit.
I have taken philosophy courses myself. Thought it was obvious. Not that exact one though.
I agree, binary thinking is often a handy shortcut. Its why humans developed it. It often offers evolutionary advantage, and it is genuinely useful with no downsides in many more practical problems. Its even really, genuinely fully true on occassion, as I said myself. Chairness, imo, has at least one binary state that makes it not a chair if it is turned off.
None of that means taking it as the default is not a trap. The same way humanity's evolved depth perception can result in false results thanks to optical illusions (which is not "just" a novel party trick, optical illusions to trick the brain have been used in warfare and resulted in death of combatants) despite being unmistakably an evolutionary advantage, binary thinking can even moreso trap one in false assumptions.
Even given your example, many a events can be more accurately be described on more complicated spectrums. For example, a concert is an event. So let's say the singer came, sang a single song, then left. Did the concert happen?
Binary thinking cannot answer that fully truthfully. It can only be answered depending on WHY the question is asked. If the question is asked in order to find out whether the singer had an alibi, then yes, the concert happened, the singer was there. If the question is asked in order to find whether the concertgoers deserve a refund, then no, it didn't happen, they deserve one. But if one searches the abstract and full truth of the event, only nuance and spectrum can answer it. In that sense, binary thinking is helpful but won't give a complete answer, only a useful answer.