By Lakshmi.Jaerik 2009-12-28 21:25:38
The "blink" was put in, from what I understand, due to texture loading limitations on the original PS2 version of the game. Something about the textures or models not loading into memory fast enough to do armor switching on the fly without seeing something funky, so they just blinked your whole character model out for a couple seconds every time. Pretty hacky way to do it, but a necessary compromise at the time. As evidenced by the Windower plugin that (I believe) simply intercepts the DX call to blink you out, it's not necessary on PC systems.
The fact people lose target on you when your model blinks out is due to the nature of the hacky solution. However, it shouldn't interrupt your actual actions -- those are done (mostly) server side.