However, until they actually test it out for themselves, both they and the talent pool are not going to have a clear idea on whether such practices work well to improve the hiring process and hence source the right people.
But whatever maybe interviewing and the process of recruitment is bound to have some false positives/negatives which are completely fine given the fact that the pool is humungous and that the candidate may in the future seek to establish themselves by improving upon their lack of skill by filling in their knowledge gaps and the companies should provide adequate support and morale boosts for such employees, those who strive to achieve better knowledge and skillset given enough time and backing.