Kleiner's lab

[shyruz]

Why was Kleiner's lab barely changed throughout development?
The layout, and really the textures of Kleiner's Lab was barely changed during development, aside from the layout's entrance, the huge room, and it getting smaller. Is there a reason for this? and why is HL2DM's e3_steamlab so similar to the beta layout?

[Bruner]

In that instance, I guess they found something that worked well early on and worked from there.