People like deadlines because people like accountability. There’s nothing wrong with that, apart from the fact that sometimes it’s impossible to know how long something will take, or cost, or even look like in advance. Creativity, in other words, is at odds with arbitrary deadlines:

We may tease them for their diva-like behaviors when they feel persecuted by a deadline, but we have to admit that “develop an amazing new idea” is not something that slides into your schedule, like pick up lunch or respond to new clients. Nor can systems be tweaked and extra hands hired to help hit a goal that requires innovation, the way they can when mundane busy work is piling up. And yet deadlines are a fact of life for any company that wants to stay competitive.
Time is a human construct, not something that's objectively 'out there' in the world. As a result it can be interpreted differently in various situations:
Creative work operates on “event time,” meaning it always requires as much time as needed to organically get the job done. (Think of novel writers or other artists.) Other types of work operate on “clock time,” and are aligned with scheduled events. (A teacher obeys classroom hours and the semester calendar, for instance. An Amazon warehouse manager knows the number of customer orders that can be fulfilled in an hour.)
I don't particularly like the phrase 'creative people' in this article, as I believe everyone is (or at least can be) creative. Having said that, I agree with the sentiment:
Creative people need another scarce commodity: mental space. Working in a large team and constantly collaborating as a group doesn’t allow a person the clarity of mind to solve problems with fresh ingenious ideas. “Alone time or working with just one close collaborator seemed to be the key under the low time pressure conditions,” says Amabile.

Creative people, she adds, “have to be protected. They have to be isolated in a way, from all the other stuff that comes up during a work day. They can’t be called into meetings that are unrelated to this serious problem that they’re trying to address.”

Source: Quartz