In answer to your question as to why cables and fuses are always harped about but not speakers and amps and what have you is that they seem to get a pass nowadays but that wasn’t always the case.
Those in the know used to harp about how all a speaker needs to be is this and all an amp needs to be is that and so on, because, measurements. There have always been various opposing camps on them but the dust seems to have settled on those debates and it’s all chalked up nowadays to preference.
It won’t be long before wire and fuse debates die off due to (long overdue) natural causes, and deservedly so.
All the best,
Nonoise