I used to think being flexible was wrong. I associated that with being slimy and slippery, and not being true to your word. People who danced around the subject were charlatans.
Now I evolved to thinking that being flexible is a state of mind. It’s not being non-committal, it’s being open to different ideas. It’s about being able to brainstorm and be creative.
There are certain people who can do both - be flexible when needed and solid when required. This is a hard skill because it requires a good sense of timing and awareness of situations. More often I see certain people who are the flexible type and some the solid, which explains the good cop/bad cop situations.