True, somewhat, but also not true. I would have a hard time listing Bob Dylan and Bruce Springsteen as being "pleasant" voices

. And some very renowned current pop/rock singers have amazing voices.
Amy Lee (Evanescence) has one of the better voices I have ever heard. Billie Eilish re-released her most recent album in an isolated vocals version. It blew me away how good of a voice this young lady actually has, Halsey has a really great voice. So yes, many are pure "noise" but many are not.
Ignore all the hype and "pop" and actually read Taylor Swift lyrics. Much of it is fairly amazing poetry. Some at the levels that folk singers I grew up with, some even better. Think about it with an open mind, she wrote, recorded, released a chart-topping duel-double album with 31 songs, all while doing the largest world tour in history. Read the lyrics. Some of the best poetry I have seen in folk albums even though this certainly would not be classified as "folk"

.
The art has changed, sure, but much of it is still extremely high-level art. A great example, I have been recently taking guitar lessons from this guy who has his own band and subs in with two others. He is actually going to be doing a summer East Coast tour subbing in a friend's band. I purchased and listened to the most recent EP his band has out. Like much of new band's material, available on Bandcamp. While I am not a fan of some of this new heavy metal screaming vocals, the few songs that he actually sings shows an amazing voice. I asked him how he can do this "screaming vocals" and still be able to talk after the show

. He related his background. He went to school for music theory, classic guitar and has years of vocal training. This new "screaming vocals" has a very definite method to not damage vocal cords. There are now college level classes on this type of vocal training. Therefore, it may not be my favorite type of music, but I cannot dismiss that there is true artistry involved. Adam proves this to me over and over when he shows me (that I cannot do I might add) some guitar methods. Incredible talent even though his band is extreme heavy metal.