There is nothing wrong with doing that, imo...however, I think a few things need to be considered, or should be. Honey goes through phases before reaching maturity. well, moisture content and thus sugar concentration anyways. this is part of the amazing aspect of bees making caps breathable, and how they take care of it, fanning and dehydrating. If, one takes a spectrometer tests the concentration of the honey and it is within what they desire, and there is enough left for the bees then, I see nothing wrong with taking it, if there is enough year round, especially if it is attempting to get it as monofloral as you can, also.
Big operations I think stay within schedules though, they often leave their hives and let them do their thing, because it is no doubt more expensive to have things operating 100% of the time with the hopes of product, and not getting it. not to mention if things go bad later in the year for some reason, it is a lot easier to have big losses or expenses I'd think to try to compensate after for those issues. So, I'd imagine they try to keep things to a point of harvesting when it is the best advantage to them only, I wouldn't know though for sure, I'm not a big operation nor do I know how they run specifically though.