Does anyone else share my concerns?
Yes. The Index has gone from the electronic copy as well. Slippery, you are partially correct; if you know what to search for (and of course if you haven't joined up the three separate PDFs, GEN, ENR and AD, a search is even harder). Often though I find myself going into the index to find the topic, then going to the page.
Not having an Auto-Index in this day and age is non-sensical. Word Perfect could do indexs 15 years ago.