You never stop learning... even if you feel like you've read through the entire forum
Back to the topic:
I am also skeptical, my better(?) half less so. There were also statements like: We have been building almost exclusively with design plans for nearly 10 years, partly because they are detailed enough, and partly because the execution planning was only completed at the handover of the house (paraphrased).
Of course, if the plans are only finished by the time of the house handover, then I might as well save myself the trouble. I had assumed that construction only starts once the execution planning for the respective section is completed... but I am just an amateur