So then why did you buy a technical computer and only run it dumbed down?
That's a fair question, and I can tell you. I bought mine after Shearwater introduced the Recreational Nitrox Mode, thereby turning what had been a "technical computer" into a computer that behaved just like the computers I had owned previously. The Petrel appealed to me because: (1) rugged construction; (2) large, bright display; (3) intuitive 2-button user interface; (4) company's stellar reputation for customer service; (5) well written manual; and lastly (6) I have to admit that the video on their website explaining the founding of the company resonated with me. All of this was night-and-day different from the computers and manufacturers I had dealt with before. The Petrel's rugged construction was immediately apparent--my old Suunto Zoop just always felt kind of junky. Sure, the Zoop may never have failed me during the kinds of relatively easy dives I do, but I just don't like the idea that they cut corners on its construction any more than I like that idea when it comes to other things I own. And if it had failed, I have read horror stories about Suunto customer service. Both of my Suuntos had screens that were so small as to become increasingly harder for my aging eyes to read. Their 4-button controls were difficult to use. Their batteries were not user-replaceable. Having used a computer at the extreme of having a small screen and a non-user replaceable battery is no doubt why I gravitated to the other extreme: a big colorful screen and a battery system so elegantly simple that I could change the battery to my heart's content and never be concerned I would be without power anywhere in the world. Granted, there are other computers out there that meet some, if not most, of these criteria. Computers with big, bright screens are now almost commonplace. Many have user-replaceable batteries. There are manufacturers with better reputations for customer service than Suunto. But it's the combination of all of the things I listed that led me to buy a Petrel.
To repeat what I have said previously, I don't consider running the Petrel in Rec Mode as "dumbed down." The intelligence--in software--is unlikely the major contributor to the Petrel's cost. Whether in Rec Mode or Tec Mode, it still has the same high quality hardware and is still made by the same upstanding company and, in my mind, should cost the same.
You couldn't find a much less expensive DC that would allow you to dive exactly the same way?
That could be said about lots of types of dive gear. More expensive does not necessarily mean higher performance. As I noted above, factors in my decision included more than just how it would "allow me to dive." Anyway, if we include "peace of mind" and general happiness with the product and its manufacturer within "dive exactly the same way," then no--I am not confident I could have found a much less expensive DC that would allow me to dive "exactly the same way."
Also, "much less expensive" means different things to different people. We're talking about a few hundred dollars difference, which is less than a plane ticket from Atlanta to Cozumel, and a heck of a lot less than a plane ticket to the Asia-Pacific region. It may even be less than the cost of my time if I were to find myself having to deal with a repair by an obstinate manufacturer. I am confident the Petrel will last me many many dive trips.