Cost/Value would need to be assessed based on how comprehensive its coverage, how much extra work is required to complete it, and how widely it is accepted in the market, but definitely worth paying for.
I would like to receive from the builder a full list of materials and equipment installed with supplier and warranty details, maintenance requirements and schedules, certifications, etc., stored in a secure cloud system that was able to be passed on to the buyer with additional information from my experience (e.g. checklist of things to do/check if the house is unusually cold, hot, damp, etc.) and enhanced with additional information from maintainers (e.g. annual gas safety certificates, etc.) This material must be standardised and certified by suppliers so that it can be accessed and trusted by agents and valuers before sale or refinance.