I get what you're saying, but I've been in interviews where I learn things that instantly make me lose interest in the job.
Examples of interview-specific job issues: * The actual job I'd be doing is different than what is in the position description; follow-up questions clarified that the parts of the job I wanted to do found in the description were very miniscule part of the job * The work culture is horrible. While the job itself looks great, getting answers from the interview team gives me a sense that it's dreadful to work there and I may end up hating it * Benefits or pay issues; sometimes jobs don't bring up benefits or pay until the interview phase, and sometimes you have to ask as they won't tell you; if the pay is too low or benefits suck, then it's good to know before going too far into the process * The supervisor sucks; if your future supervisor interviews you, asking them questions can get you a feel for their personality, management style, values, etc. I've had red flags from potential supervisors during interviews.
There are things in a job that one may not know when applying. Asking questions is a good way to learn about these things, as some job descriptions can be misleading.