A workflow designed by an engineer optimizes for some combination of time, resources, cost, etc. Most people don't want something that optimized as it is very brittle to change, so their own ad-hoc workflows are "better". At least for general users that don't have a very small selective set of tasks.
In software, we would probably call them "software engineering" and "hacking" approaches. For example, in the Linux Kernel init discussion, systemd is an engineering solution, while traditional init system is a bricolage solution.
If you break an engineered system down into its components and never consider all the ideas and fabric that link them together in an engineered system, you could reduce anything to bricoleur.
I disagree. Yes, Unix is deliberately engineered to allow for bricolage. But many (most) things aren't. Take for example classic PC and the iPhone. You cannot break down iPhone to it's components and remix them. You could do that with a PC, to some extent.
McGyver is a bricoleur - same goes for the vehicle building parts of an A-Team episode. Tony Stark is an Engineer.
Of course an Engineer can probably also work with make-shift conponents in an emergency, but it is not their preferred situation.
Bricoler is improvisation, adaptation, and creativity with a constricted set of materials and methods. Engineering is changing the set itself.
When you're on your back in the data-center in a tight spot trying to unscrew something but you don't happen to have a screwdriver, bricolage would be to use a knife-tip instead because that's just what you happen to have and can make do with. Engineering would be to crawl back out, head out to the store, find the proper screwdriver, buy it, come back, and crawl back down to unscrew it.
In a software sense: most people solve their problem of the moment (extracting data from a bunch of files) using bash, cat, grep, sed, and some quick regex editing in their favorite editor, copy-pasting as they go, etc. They're going to write a specific program for just this one particular problem. (This is related to whether it's worth the time [https://xkcd.com/1205/ ]). Or the stereotypical Grandma who sends a favorite picture by downloading it, inserting it into a Word document, printing that, scanning it, and then clicking on the "send via e-mail" button in the program, and looking up your e-mail address in her (physical) notebook.