why would you want live view if you shoot in sunny or bright conditions where there will be glare ??
1) Because there won't be glare, necessarily - modern panels have anti-glare protection.
2) Because you don't always shoot in "bright conditions" - you shoot in many, many conditions.
3) Because regardless of bright conditions (which don't matter, see point 1), I may want to shoot from a position where I can't put the huge hunk of metal (camera) to my face in order to see. Indeed, I often use it for macro photography where it is not practical for me to use a viewfinder.
4) Because live view can give me a lot more information, including whether a shot is in focus or not under conditions where I can't find that out in a viewfinder (say, a very long lens).
There are many more, but that's a good start.