People selling stuff (to clients, to investors) think having a big open room full of developers using computers is impressive enough to help them sell. The developer zoo.
A normal professional office with hallways and doors doesn't look that impressive, or might but only if dedicated lobby and (client) meeting areas have had some real money & space dedicated to them.
In recent consulting scenarios, the clients seemed to feel that leaving developers alone in quiet areas was preferred. Though they had a direct connection to the software being built for their needs compared to someone who is looking to be woo'd & awed.
A normal professional office with hallways and doors doesn't look that impressive, or might but only if dedicated lobby and (client) meeting areas have had some real money & space dedicated to them.