Some mastermind back in the early days of Corporate IT saw this concept and used it as a model for our SDLC. By adding time to our control points for code freeze and time windows for testing, staging and the like, the overall process is lengthy and thus, looks more valuable to the business stakeholders.
A project that may be a week or two of coding will take several months to allow for planning scope, creating and reviewing requirements, technical designs, Info Security reviews, Architecture reviews - all before the first line of code is written. Then with testing windows of a month for each environment and a code freeze that could be a month or more, depending on deployment schedules, it is easy to make even something smaller than a bread box take 6 or more months from conception to deployment.
This adds value. With this we are able to explain high project costs to our business stakeholders, the ones approving the budgets, while at the same time making sure we don't have to break a sweat to get things done. It is an almost perfect world for us.
Add to this that this model will stifle a small third party vendor and it is hard to pin the actual value of timelines. Small vendors try to remain nimble and react quickly- their model not only thrives on it but almost depends on it. They can hardly afford to sit on a tested solution for a month long freeze. They want to do something new or react to enhancement requests or respond to a bug. The Corporate IT Timeline hinders them from all of this. It brings them in line and reduces them to little more than ancillary outsourced coders.
If third party solution providers are forced to fall in line with the Corporate IT Timeline then they can be controlled. And it is easy to convince the business partners that this needs to happen. Business may appreciate and enjoy the agility of smaller firms but as we have said before, they can ill afford to fight the risk and career minded professionals won't stick their necks out for the small vendor most of the time.
So embrace your timelines. See the value in them. Use them to your advantage. As risk aversion grows, so will out timelines and our kingdoms. With higher perceived value, higher costs and longer guaranteed work, we expand what is ours and increase the barriers to entry, protecting our industry- Corporate IT.