I recently registered my son for his OW course and was surprised to note that no table was part of his package but it came with an RDP. I might be a dinosaur but I reiterated the fact that even though we are surrounded by technology, you still need to understand the basics in case technology fails (by itself or with your assistance).
The analogy I used was GPS vs aviation maps for tactical low flying...The GPS receiver might fail for various reason or might bring you to the wrong spot that you entered (garbage in garbage out) but being able to X-check on the map (environment permitting) might just save your bacon and is in itself priceless.
I first got certified OW in 1978 (NAUI) when the basic set-up was to wear a BC device around your neck, a wrist mounted timepiece and depth gauge, a one reg set-up with self-contained reserve (an OOA situation meant getting really really close to your buddy for buddy breathing) and a tank on a back pack.
Nowadays, I dive with the full meal deal but as long as I still have a depth gauge, time piece and tables, I can still function and enjoy diving. Some of my friends dive with fully air integrated/computer console and I have seen time when the dives had to me modified and/or even be cancelled because the lost of his console mounted computer meant he lost everything including depth (he still got it from his wrist mounted computer) but more importantly...air pressure monitoring system. That just reinforced my conviction to remain KISS and stick to basic analog system.
At 15 yrs of age, he will be by my side when he goes scuba diving. Even though my girlfriend and I are both computer equipped and he is RDP equipped, there will always be tables (Air, Nitrox) as part of our scubatravelling luggages as I have no intention of cancelling my diving (local or on vacation) due to equipement and/or battery failure.