Your missing the point, this is exactly what you not supposed to do on any tempered glass, older glass you probably may not encounter it, most manufactures now state not to use scrapers as it will likely cause scratches.
The problem comes back to window cleaners we expect he glass to be free from micro particles, as we had the luxury of in the past. The thing is these micro particles are not visible to the naked eye, nor do they impose any structural defects to the glass as a whole. So for all intents and purposes the glass is flawless, unit you start dragging a scraper over it, then the micro particles get dislodged and cause damage.
So now the window cleaning community has the sole responsibility to educate every trade who works near the glass that it should be covered to prevent any deposits of construction debris. In my area about half a dozen builders have started to cover new constructions as they have been stung by full house window replacements due to hiring the cheapest cleaner, who went out of business due to the damage, so the builder was left with the bill.