There's actually a good argument FOR loudspeaker accuracy that uses personal taste and preference as the premise. There is always plenty of room for personal taste and sometimes that's is as simple as good old fashioned bass and treble controls. But if your speakers are not accurate to start it's likely you'll need greater amounts of manipulation and correction to achieve your personal taste, and possibly have to be readjusting things for all different kinds of material which can be cumbersome. An accurate loudspeaker gives you a better foundation upon which to lay your personal tastes upon, and it starts you closer to the artist intentions and what they wanted it to sound like.
Sometimes changes made also can be detrimental to the sound, especially if you have a speaker directivity issue or a speaker design flaw or even a room related acoustical problem. Starting with a loudspeaker that's more accurate minimizes the problems of outside sources. One example is an accurate loudspeaker does not make a room problem go away, but a really good accurate loudspeaker can hide the problem more and will sound better.
Someone above mentioned "flat" but I didn't use that term because loudspeaker accuracy isn't just being "flat". You might have a flat speaker but what you hear from you chair isn't anything near flat and it doesn't sound very good. Worse than that if you try to make it "flat" in your measurement you'll make it sound even worse ! That's usually because in order to make a speaker that's already "flat" as measured directly on axis and nearfield become flat at your seat you have to actually make the speaker less flat in it's direct sound. This is essentially what auto EQ programs do and precisely the reason they are not too reliable with their results. Flat isn't always what you want, but accurate usually is. That's why I like to use the term accurate, it can encompass multiple important loudspeaker variables simultaneously (distortion, frequency response, off axis response, dynamic range ability, and so on). Flat won't always ensure you get great sound and sometimes certain things can sound a little better with a touch of personal taste adjustment.
It's even likely that some of the older music was mixed on less accurate loudspeakers and which case the recording itself is flawed. That's a solid reason to apply a little correction. However unless you are only going to listen to only one flawed recording it really won't make much sense to choose a loudspeaker that is less accurate but can makes a certain recording sound better. That effect is gone when you change material and it's likely to be worse on many other things. Movie sound tracks add another layer of complexity. Most people like to listen to music and watch movies, in which case ideally you want great performance on both. If you have a speaker that's less accurate movies won't sound correct either, or you'll be constantly calibrating and playing with settings in a struggle to balance things over a wide range of materials. I think it's easier to start with a really good and accurate loudspeaker and make fewer smaller adjustments based on different material and sources.