Factory procedures, pulled for your VIN
Mercedes-Benz publishes repair procedures specific to the model, model year, and equipment level: which panels may be sectioned and exactly where, which joints are welded and which are riveted and bonded, which fasteners are single-use, which components cannot be heated, and what has to be initialized or calibrated afterward. We pull those documents for your VIN before a technician starts, follow them, and put a copy in your file.
The boron steel example is the one worth understanding. The A-pillar, B-pillar, and rocker reinforcements on these cars get their strength from heat treatment. Apply a torch to straighten one and you locally destroy that strength — the pillar looks correct and folds in the next impact. Nothing about the panel announces this. The procedure does, which is exactly why we read it.
