I agree that it's weird and, from a consumer stand point, makes no sense. Though in practice it may turn out mostly insignificant. (Weird how they had analog triggers in the original classic controllers where they had zero use, though.)
So I just put all current controllers on my desk. Got a DualShock 3, 360 pad, Wiimote/Nunchuck and Classic Controller Pro and I googled some images for the Wii U Pro controller and Wii U GamePad.
DS3's triggers are convex and have a weirdly
sluggish resistance to them
360's triggers are concave and give in easily and quickly, feels very responsive
Wiimote B-button (concave) feels very good, easy and quick to get a reaction from. The problem with that is the placement and the relation to the rest of the controller. It's not comfortable to reach for multiple presses and precise interaction since the Wiimote is just a simple rectangle.
The z-trigger (flat) on the Nunchuck works much better in comparison to the B-button since your hand can comfortably hold the Nunchuk like any other controller due to the ergonomic shape.
The Nunchuk similar to the classic controller pro (also flat). The only gripe I have with it is that there's not enough feedback, you can't push it in very far.
Now looking at the Pro Controller, the Z-triggers are shaped (concave) like the 360 triggers and appear to have similar travel like the Nunchuk z-trigger.
The Wii U GamePad has triggers shaped like the Wiimote's B-button. That so far is good since they seem to be way more reachable and overall more usable than the Wiimote B-button due to the ergonomic grips on the GamePad. The
Wii U GamePad tour video makes them look like they have a little more push-in-feedback than the Nunchuk even, so that's good as well.
So the ZL/ZR triggers may be a step behind the 360's analog triggers because they lack analog input but in terms of comfort and usability, they should be about on-par (gasp! that evil word again!). Should not turn out to be a big deal. Maybe analog-sticks for gas is the new thing anyway (like the weird analog sticks for Hockey sticks and basketball throwing?!)
I can only make these guesses based on images since I've had no hands-on time with a Wii U so far.
finally upgrade? buy old video cables?
it only comes with the HDMI cables. no other video/audio cables included!