[TeeMassive]

The main difference between the two is that the cutter approach means that the two features must coexist at more or less the same place in the code and that the architecture must be adapted to accommodate this half-dead half-alive chimera.

In the end you have three states two deal with with the code before the new feature, the chimeric code and then the code with the new code enabled.

With the steel thread approach the feature exists on its own and is used and tested in production at the very beginning, although with limited traffic first. Important to note that the author seems to assume a micro-service architecture.