yitzyk:
I personally consult with gedolim on many things. I have discovered that one’s status as a gaon and talmid chochom is not synonymous with expertise in everything. I will not cite specific rabbonim and their areas of ignorance (not meant to be degrading, just factual), as that would constitute lashon horah. Generally, they will dismiss the questions respectfully and redirect them to experts. I have no problem with seeking advice on subjects that the rabbonim know as areas of expertise and experience. However, I am appalled when I observe some functioning outside their realm, and giving poor guidance. This has happened with well recognized rabbonim, not just young less experienced ones.
I am also acquainted with many rabbonim, including Roshei Yeshivos, Menahalim, Rebbes, Poskim, and Dayanim who frequently consult with professionals in many fields, and make referrals to their expertise. As they state openly, they lack the expertise in the practical aspects of the shailoh, and defer to those who do have it. As for social issues, I revere those who have opinions based on a broad range of knowledge (I am not including secular or college training), and have no problem seeking their advice or input. I am likewise acquainted with several who give advice about medical issues, mental health issues, kids at risk, and shalom bayis, giving notoriously bad guidance because these areas are outside of their expertise.
Most rabbonim possess smicha, and most smichos are based on Yoreh Deah. That qualifies them to respond to many kitchen shailos. This might not include shailos noshim, nor might they be qualified to pasken a question about the kashrus of a mikvah. As long as they function within the realm of their expertise, they are a great service to Klal Yisroel. When they go outside that line, their advice may not be better than that which is obtained from a stranger in line at the bakery for challos on Friday. Don’t start with the Ruach Hakodesh stuff.