As a 25+ year veteran of the security industry I have seen my share of this kind of work. Some I am sad to say was by people in the same company as me back in the 1980's.
There is a skill set and a cost for the time it takes to neatly cable and label an alarm system but that cost is long offset by the added hours a service technician has to spend trying to fault find in the future.
In many projects awarded under tender, a lower grade of workmanship is seen due to the nature of tenders being driven by price and the fact that in 12 months time it will be someone elses problem.
A quality consultant will specify that all cables will be labelled at each end and at any pit or junction box. Also that a cable management system must be used.