Synthesized answer
The provided passages state that Austin's theory of 'illocutionary forces' has important bearings on a wide variety of philosophical problems [1].
The passages do not explicitly detail what these practical implications are, beyond their connection to philosophical problems. Therefore, the specific practical implications are not fully described.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: How to do things with words by J. L. Austin Description: This work sets out Austin's conclusions in the field to which he directed his main efforts for at least the last ten years of his life. Starting from an exhaustive examination of his already well-known distinction between performative utterances and statements, Austin here finally abandons that distinction, replacing it with a more general theory of 'illocutionary forces' of utterances which has important bearings on a wide variety of philosophical problems.