Exactly. People buy things all the time whose performance is greater than they will ever need. For example, cars. Most are capable of doing well in excess of 70 m.p.h., but this would only be of use if you regularly use the autobahn (which I suspect few British drivers do). It does mean that you have some capacity in reserve. The same is true of broadband - you normally may only need 36Mbs but if some temporary problem halves that speed your connection might not meet your requirements. So it's sensible to buy something with a little extra capacity. Again, some are happy to wait a hour or more for large downloads - others want them immediately.
My
bête noire would be Netflix, Prime, Apple TV, etc. Many spend more on such streaming services than on the connection. To me that's a waste of money (I can't keep up with what's available for free let alone paying for another "57 Channels and Nothing on"). But I've no reason, or right, to condemn others for (IMO) wasting their money in this way.
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Real stupidity beats artificial intelligence every time.
Terry Pratchett