First of all… hearing is subjective so of course the ear can be fooled.
Second of all, wires and electronics do need a period to get warmed up. Electricity flowing through wires is no difference. Just use your ears and you can hear a difference over time.
Finally, No one says it is the most important aspect, and the gear will have a much greater impact. So just spend reasonably and don’t blow your budget. There are no absolutes and just have fun.