I'm all for experimentation and a slight change in direction. He's done it plenty of times in the past with mixed results. But Chaos has very little creative empathy with Paul's own personality.
So you think Chaos isn't really him being true to what he is as an artist. Interesting. I'm a little torn between two sides, but lean towards one more than the other. The first is that Chaos sounds like a 65 year old should sound -- it doesn't sound like most McCartney albums because it's the first time he's let himself show his age. It's great that he still tries to sing new rockers like Only Mama Knows, but he's not kidding anyone. The other side is that he's just ageless and his musical personality is just to try and sound young and peppy and optimistic his whole career.
I lean more towards the first one. He was going through some serious stuff with his marriage, you can hear the age in his voice, there's real skill in his playing.
Also, there are loads of stereotypically McCartney moments on Chaos. The 'Little Woman Love' piano of Promise..., English Tea, the 'secret' track could be an instrumental off the McCartney album, This Never Happened Before is a cousin of Through our Love.
Even something like At The Mercy, where atmospherically it's quite a departure, the playing reminds you it's him. The way he plays guitar, bass, keys and drums hasn't really changed since 1970 -- the personality of Chaos is in the playing. That was what he wanted to do artistically at that point, no question.