Ah yes I see what you are saying.

I also think the fact you have to repay benefits you had prior to working - within a tax year is a real disencentive.

They should ring fence FTB A and CCB levels like they do FTB B as that compounds the losing benefits.
Yes, when I first returned to work after DD2, it was a temp role. I had a massive spreadsheet set out to see if it was worth it, comparing income FTB, childcare fees etc. Basically I had to save most of what I earnt, as I needed it to top up the reduce the FTB for the rest of the year. I work in the area of finance, so I was able to work out the figures, but it would be a struggle for many other parents. How many do some work, advise of the increase annual income and then have to handle a drop in FTB, who have not prepped for it? Probably too many.

There is so much interplay, one thing goes does, but another goes up, then something else goes down. I suppose it could be argued that a family should not rely on these benefits, but the reality is that families do.