Even Paranormal Romance. That genre has 292 Coming Soon books, versus 1,112 books released in just the last 30 days.
The competition for reader eyeballs has stiffened considerably. You only get 30 days of eligibility on the Hot New Release list and if you wait until then to go for that spike of sales, you have to compete with 1, 112 other books. Pop lists on the other hand with a longer preorder period can be conquered if you can spur your readership into buying your preorder. Just because it's your first book, you still need to have a readership anxious for the book, either through blog posts, chapter samples, etc. The higher you can rank on a pop list or a hot new release list, the more likely Amazon will email out your book as a coming soon book.
I do agree that conventional wisdom for a loooong time was getting that first day sales spike. But that spike has needed to be higher and higher. #100 on the PNR Bestseller list is #1200 in the paid Kindle Store right now, that's well over 100 sales on day one on Amazon.com just to hit #100. #100 on the Hot New Release list is #4277 in the Paid Kindle Store which is about 45-70 sales on Amazon.com. Just last September, to get #1200 in the Paid Kindle Store took only about 70-80 sales on Day One.
If you can't get those sales on Day One trying to have 10-15 sales to get you on some keyword pop lists etc. can be an alternative. The reality is it's definitely taking more books and more readers to chart in some of the more popular categories. Doesn't mean a new author can't break into them, just it's going to take a very strong plan to get the first day or preorder sales going and probably implementing that plan over a number of books in order to build a following. It might not be until your 4th or 5th PNR book that you can actually chart, that's after working your tail off to build a readership reader by reader.
I'm not trying to dissuade anyone from what works for them. Just sharing what I've experienced stalking the charts. LOL.
I do think since Amazon has introduced Preorders to all of KDP, the market has changed considerably in what strategies are needed to gain visibility. I am only just now beginning to accept that long-term, it's better for me to have a good preorder period of visibility, then some visibility when the book is out from the sales ranking, and keep the whole machine going by constantly having a book just released and a book on preorder for each of my series. At this point, 8 months in, my books and name are one a number of pop lists, hot new release lists, and bestseller lists and it keeps my name in front of my target readers. They may not buy my book the first or second time they see me, but eventually, they see my books often enough, they're going to check out a sample or read a blurb.