Money making
This seems to have little to do with Quality control and lots to do with making money.
Who knows your progress better than your instructor? so he is in the best place to know if you are fit to be sent solo X-C.
I would guess that your trainning is punctuated with all sorts of "club rules" that delay your trainning and are not required by CAA regulation resulting in extra hours flown.
You are at the X-C stage in your trainning it is probably too late to change training providors but as soon as you have your PPL go take a look at other flying clubs............... a lot of them in your area offer very good value for money.