Pure ideologies work until you have tight deliverables. And "feature toggles" become problematic if you need to do a "release" and don't want to have undocumented (possibly unfinished) functionality that is one malformed configuration file away.
At the end of the day, it is about balancing "clean" development with acknowledging thjat you are going to need to cut corners. Generally speaking, "open source" projects can get away with a strong focus on ideology because they don't have deliverables that can mean the difference between being rockstars and being this week's tech layoffs.