"I think it is really stupid that WIFI is still external on the D5 as can be clearly seen in the D5 video."
On the contrary. Having this feature as an add-on makes the camera less power-hungry for the many of us not wanting or needing a Wi-Fi connection.
I concur!
That, and the legacy of the erstwhile "pro" cameras of yore, has inculcated a generation, or two, of original adopters with a deep appreciation for any semblance of, at least, a semi-modular design strategy. I still get giddy when I can utilize an accessory originally designed for an F or F2 on a more contemporary platform, something increasingly difficult to do these days.
Now, I had composed a well thought, concise yet informative, thesis to defend my philosophy. However having just proofread it, and discovering that at best it was lacking in levity and at worse condescending and boorishly ill-informed, I hit myself over the head with my keyboard, effectively deleting what would have resulted in years of lingering shame.
Cheers!