I just finished "re-recording" 4 vocal tracks... For my good friend Mr. No999. It took several days.
Vocals are "tricky?"
And compressing them, EQing them, making them sit in the mix? It's all tricky. However, a song with vocals? The vocals 1) must be heard, 2) must be legible? (however they are clearly not always) and 3) "See 1)" It's tricky to make them sit right in the mix. If it's done correctly, you don't notice it. If it's done "incorrectly?" you notice it every time...
IMNSHO, a song with vocals tells a story? And at the end of the song, you should be able to ask someone who just heard it for the 1st time, OK, 1) What is the name of the song? (it's in the hook), 2) What is the song about? i.e., what is it saying? And if it is well written, well performed, well recorded, and well mixed? Then they should be able to answer those questions with no problems.
A song w/vocals is fine with Lead instruments? However, the vocals should take "center stage..." They are conveying the meaning and the message of the song. As a lyricist, and a singer, I have STRONG opinions on this subject.