In an ideal world all speakers would play all kinds of music equally well. In the real world, it's sometimes a bit different.
The usual musical demands of Metal and typical chamber music can be quite different, and the same can be said for other musical genres as well.
When compromises need to made due to budget and/or space limitations, there are different speakers made with different balances of sonic assets and deficits . As no speaker at any price has yet to achieve perfect balance in all regards, it not surprising that at the lower end, the balances might be, well, less balanced. To ignore these differences can lead to less satisfaction for different purchasers with different priorities.