Obviously it depends on different people and certain standards they set on what they want to see. Others prioritize rap and others prioritize singing. And under that there are also certain preferences others want to hear. Someone may prefer flow and delivery and another may prefer lyrics when it comes to rap. In the same way another may prefer vocal techniques to vocal colours whiles another may be vice versa
It’s just a matter of preference at the end of the day and what they are looking for to stan in a group.