I don't think you know what the word "discriminatory" means:
Adjective
Making or showing an unfair or prejudicial distinction between different categories of people or things.
You may say that it is not practical to not be discriminatory. You can also say that it is not immoral to be discriminatory. Both of those may or may not be true.
However, it is certainly discriminatory to use a test that is biased towards educated white men with college degrees and access and time to read newspapers.
Yes it is, if you're hiring them for shoving shit around. If you hire for an engineering position (what was this Edison guy doing anyway?), then those fancy writing and math skills and whatnot might be quite necessary.
Adjective Making or showing an unfair or prejudicial distinction between different categories of people or things.
You may say that it is not practical to not be discriminatory. You can also say that it is not immoral to be discriminatory. Both of those may or may not be true.
However, it is certainly discriminatory to use a test that is biased towards educated white men with college degrees and access and time to read newspapers.