The NER Flowchart is an Engineering Masterpiece, which we treat as Ultimate Authority.
We know that we must train new models from scratch. Therefore the decision box "Can you write rules....?" is pivotal, since we expect to avoid ner.manual for production-level work. We infer that "[to]write rules .... (Matcher patterns)?...." can mean "using ner.teach to generate patterns." This is our current procedure, and we want to be certain that we're in line with the flowchart.
Prodigy + SpaCy + your voluminous documentation and patient care of your users makes for an outstanding environment for learning, training, and least-cost experimentation. Thank you (from a learner and trainer)!