Many people smarter than me do think that caching [SQL] queries proved to be really bad idea (regardless of DBMS). Why caching API queries would be better? Eve

Many people smarter than me do think that caching [SQL] queries proved to be really bad idea (regardless of DBMS). Why caching API queries would be better? Even if I would use query caching, I cannot imagine how it would help me to deal with really long queries (say, lacking proper indexes). Caching doesn't help when your query runs for 30 seconds – nobody will wait (and produce cache for others) so long.