Why did Vader need a big control panel on his suit's chest?

Question

After reading this question and this question, I read Darth Vader's armor article on Wookieepedia. This passage made me frown :

The monitoring panel beeped frequently and for no reason, the lights seeming to serve only as steady reminders of his vulnerability. His electrical systems were woefully delicate, and he was forced to protect his vital chest panel when dueling. This system was so vulnerable that Antinnis Tremayne was once able to deactivate Vader's entire suit by pressing one button on his chest control plate.

The suit, and more specifically the helmet, use some high technology for the interface. But the chest control panel is made of huge lights and big freaking switches, just like if it was salvaged from an archaeological museum. It was even replaced on at least two occasions, but its odd design was globally kept.

Why incorporate such patent weakness to the armor? And why would Vader tolerate it?

Answer 1

There's only one reason that you build an obvious vulnerability into a system - to keep it from getting out of control. I would guess that to get close enough to mess with those controls (without Vader being able to stop you), you'd have to be pretty powerful. After the events of Revenge of the Sith, there were not many beings left in the universe that powerful aside from the Emperor.

In short, I'd say it was a reminder to Vader that the Emperor could turn him off with the press of a toggle switch if he get out of control.

EDIT: So how did a Padawan (Antinnis Tremayne) achieve it? Vader allowed it, seeing who could think beyond a simple direct attack...the exercise was a test of lateral thinking.