Gruber said he got a "couple of similar emails," with employees stating that they won't outright quit before they move to Apple Park, but if it's as bad as they think it's going to be then they will consider leaving Apple. During the podcast, Gruber and special guest Glenn Fleishman pointed out numerous disadvantages to an open work space, particularly for coders and programmers who aren't used to a lot of foot traffic and noise in their vicinity while they work.
Open workspaces have been the norm everywhere in Western Europe my whole working life... I've been working 17 years in open plan offices, it's just something that is normal to me. It's true that they can be noisy if the space is over filled and they aren't suited to certain types of businesses, especially those where people use phones a lot, but I don't think that is the case with coders and engineers. You do need to make sure that meeting spaces are provided and that they have good acoustic isolation and climate control (otherwise people open the doors to cool the meeting space, letting sound out).
In open plan spaces, people become more aware of other people, this has both positives and negatives.
Some positives are that you can develop a better awareness for things that others are doing, by extension you get a better idea of how what you are doing is impacted by or is impacting on those things, you get to know your colleagues better, you get the opportunity to interact with them socially and to exchange ideas, without this process needing to be formalized, it's possible to catch issues earlier, simply because you talk more with your colleagues about what you are all doing.
Some negatives are that you need to be more conscious about your impact on the space, in terms of noise or hygiene and you become more aware of others impacts on the space in the same ways. It means that you have to use the space properly, since you don't have your own cubicle, you need to use the different areas of the space for what they are designed for and not just lazily do everything at your desk, it means actually using 'calling booths' in the office when you need to make long or personal calls, gathering in meeting rooms or coffee areas when you want to discuss something with other people for more than a few minutes, instead of disturbing others in the open office. It also means sometimes working out how you can focus, which may mean using headphones or booking a quiet space when you need to concentrate, possibly having a traffic light system (green - I'm available, amber - only interrupt if important, red - don't interrupt) and respecting the systems of others or any generally established conventions.
In general though, having open spaces make people more comfortable around other people, simply by them becoming familiar, they fosters a sense of collaboration and family, which you don't get when you isolate yourself away in a box. I personally would hate to work in an isolated office, the idea seems so antisocial to me.