Not that I'm a cynic (possibly when in coma?) but does the builder you are dealing with own the estate?
Concrete is generally several parts aggregate/stones to several parts sand to one or more parts cement. After our renovations we were presented with a "We're ready to fix your driveway and back apron it will cost $XX,xx_."
Shy and retiring as always I countered (emulating JM) "You cannot be serious?"
They were, so I said thanks but no thanks and decided to do it ourselves. Doing some figurative digging I discovered that there can be a huge range in the size and type of stone content in 'concrete'.
https://www.concreteinstitute.com.a... aggregate&searchmode=anyword&searchfilter=0;
In the end in true "I don't really know what I'm biting off" mode we did it totally ourselves and got a truckload of aggregate (10-15mm stones), a tonne of sand and a stack of 40kg cement bags.
If you increase the ratio of stones slightly - it has a noticeable effect.
The image you showed is one with an incredibly high ratio, we went for a lower ratio and with a much lower range of colour and size. Too small sizes seemed an invitation to slide and too large to tripping.
With ours, it took some months before the stones were noticeable everywhere as the grains thick coating of sand/cement on top of them gradually wore off to reveal probably about half the density shown in your picture.
Perhaps talk to an uninterested party (aka 2nd opinion from another driveway provider) that you sound out on basis we're thinking of having...
Ours turned out well, and I wished I had bought that concrete mixer instead of the two large wheel barrows....
No cracks or movement but it sure works up a sweat mixing 15 barrows worth in one sitting.
