Most don't extend employment offers out for months in my experience, or at least they really try to get you to agree off the bat. I imagine someone job searching is getting an interview once a week or so. Several times, I've had delays of weeks to months after just submitting an application to get the interview. So how do you just have multiple offers to juggle at any one time?
For my part, I have hundreds of other candidates to choose from.
It's kind of like how when selling a house your optimal strategy is rarely to try to appeal to the most people. Instead, modifications which greatly increase perceived value in a smaller subset (so long as it isn't too small for your personal goals) will alienate most customers but still increase the sale value in the same timespan.
When you're applying for jobs, some companies aren't willing to play that game, and if you're playing it then that's not just fine; it's ideal. You don't waste your time on companies who won't play ball. Enough will that the strategy still works.