That office plan, and 'Library Rules', are particularly stupid in a world of lack of thought. That is, it's worse than just not thinking about it at all.
3-5 people in the office at any given day? Just build offices, christ.
One of the founders must have had a particular itch to scratch is all, and it has cost the company money so that they could have the worst of all worlds
The 'Library Rules' are dumb because one of the prime reasons you need to make noise in an open office is to share a screen with someone, as you collaborate or problem solve or whatever. This is hard to do if you have to move to a quiet room because you can't move your monitor setup with you, or have the comfort and access of the things at your desk.
Even non-code discussions are easier at your own desk, with kbd and mouse for notes vs laptop and trackpad.
Not being able to talk above a whisper, or at all, at your own desk is a disaster.