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Because the request arrives on site. Somebody asks the foreman, it seems reasonable, and it gets done — the paperwork will catch up.
It rarely does. At final account there is a list of variations with no agreed price and no signature, and the argument is about what a fair rate would have been.
A variation is raised against the programme, priced from the contract rates, and shown with its effect on dates before it is approved.
Site labour is attendance in Nest, costed against the job; materials draw from stock in Books. The programme reflects what is actually happening.
It will not sequence the works. It records the programme and its dependencies; construction planning is a discipline of its own.
It also does not price a variation you have not scoped.
Variations are agreed before they are built, or explicitly absorbed as a decision with a value.
Cost to date is real rather than an estimate, so the final account starts from a record both sides have been watching.
Products, not integrations. Each one reads the same record, so a join is a permission rather than a sync job with a mapping screen behind it.
Retention is held in Books against the contract.
Yes, against the job, from purchase orders.
Yes, from Nest, at the rate for that person.
Half an hour on your own numbers is usually enough to say whether Loop is the right place to start.