I notice that many authors these days no longer include topical indexes. John MacArthur's earlier books almost always had one, yet his recent books do not. Compare the 1st and 2nd edition of Ashamed of the Gospel. Many other books really need one, yet do not include one. Erwin Lutzer has a wonderful book entitled Christ among other Gods that needs an index. His book on the inerrancy and sufficiency of the scripture also needs one. Why are authors doing this these days? Laziness? Budget issues? Or what?