You're painting open offices in a completely negative light without seeing that they also have upsides.
I'm in the same position as the CTO above and giving everyone a private office in my company is not even remotely close to being financially feasible. What's more, a lot of engineers actually voiced a preference for open space plans over individual offices.
Cubicles are on the table as an acceptable compromise but given the growth at which we're hiring and growing, it's just not physically feasible.