I don't think the parent was suggesting that the individual developer has a personal desire to build a compiler for the fun of it. It's much wiser and far easi

I don't think the parent was suggesting that the individual developer has a personal desire to build a compiler for the fun of it. It's much wiser and far easier (assuming your goal is to have a successful career and run a profitable business) if you Keep It Simple, Stupid! Building a compiler/database/CMS/ERP instead of using an off-the-shelf one is, for well-selected business problems, a bad decision, increasing complexity, adding risk, and allowing scope creep. But sometimes, in spite of your efforts to adhere to the KISS principle, the real world is hairy and some complicated new problems need complicated innovative solutions, and instead of turning a crank to glue together some off-the-shelf libraries, you'll find yourself, in my particular example, way off in the deep end getting PCBs manufactured or, in the article, writing your own compiler. It's not bad, it just means you've got a niche problem to solve! Or that sales did a terrible job of understanding what they were offering, and something basically equivalent to the customer is just an off-the-shelf Wordpress plugin, but instead you're stuck writing a custom CMS.