For every month you spend writing code, you'll spend some amount of time in the following year maintaining that code, and some in each year after that, forever, as long as that code exists.
大多数人认为代码编写是软件开发的主要成本，而维护只是次要开销。但作者认为维护成本实际上是永恒的负担，会持续累积并最终超过开发成本，这是一个反直觉的观点，因为它挑战了传统的项目成本估算方法。
Yes, it’s been deprecated. Why? Because too few people were using it to make it worth the time, money, and energy to maintain. In truth, although I sometimes disagree with the operator changes, I happen to agree with this one. Maintaining ALL of the synonyms takes real time and costs us real money. Supporting this operator also increases the complexity of the code base. By dropping support for it we can free up a bunch of resources that can be used for other, more globally powerful changes.