In a rapper necessary in a K-pop group?

On online forums, netizens are debating if a 'rapper' is a necessary component in an idol group. Usually, at least one member is a designated 'rapper' for both female and male groups. On idol trainee survival shows, members who sing, dance, and rap have also been divided into their respective roles for evaluation.

However, netizens are questioning the 'rules' of K-pop groups and wondered if this requirement is necessary. Due to the wide music genre in K-pop, netizens are discussing their support for rappers or their preference without them.

Some say that "it is nice to have at least one," while others are voicing that "there has to be a rapper, for sure." At the same time, a good amount is expressing that they "don't need rappers, because it doesn't always sound good."

More reactions include:

"Of course..."
"I don't really care..."
"I am not really interested in rap so I don't care"
"Songs are boring without rap"
"I don't mind, because rap isn't my thing"
"There is a clear difference between a vocal member trying to rap and a rapper member trying to sing, so the quality of the song differs"
"I don't really need a rap member."
"I need rap. That's just my style..."

"I mean they have to be good lol"

"It depends. Boy groups are more likely to do hip-hop, so I think they need a rapper for powerful concepts"

"I agree, boy groups need rappers more than girl groups."

"If the songs didn't try to put in a rap portion by force then they wouldn't need rappers"
"I actually want all songs to just get rid of the rap portions"

Do you think rappers are necessary in K-pop groups?