I highly recommend you to read the short explanation of why the OECD changed the definition Updates to the OECD’s definition of an AI system explained - OECD.AI
Specifically, on the concept of Adaptiveness
Adaptiveness: This reflects that some AI systems can continue to evolve after their design and deployment (for example, recommender systems that adapt to individual preferences or voice recognition systems that adapt to user’s voice) and is an additional characterisation of an important group of AI systems. Also, the previous wording, “operate with varying levels”, might be read as describing a single system whose level of autonomy and adaptiveness might change over time, which was not the intended reading.
I think that text is an integral part of the definition of AI system: removing it would mean changing the definition. We can do it but we may as well merge this conversation with this: Is the definition of "AI system" by the OECD too broad? - #12 by stefano