To play devil’s advocate, if you already have a build process with repeatability and a close corellation to production, containers may seem like robbing Peter to pay Paul.

For one thing people almost always end up reworking their layers to go from least to most frequent changes for speed, but that often confuses the issue of logical units of work within the setup code.

And if you’re using npm or gem in a container, on Mac, You are going to experience some strong, negative feelings.