If the tech who examined your watch found evidence of damage caused by external impact, or the battery was within tolerance (or not) then that's what goes on the report. They don't get a bonus either way, they just do the job, write it up and move on to the next case.
There are two common causes for screens breaking, either external damage (usually impact) -or- internal pressure from a failing battery which has expanded to fill the space available. Both will have a characteristic appearance which will be very familiar to the examining technician.
As far as strength of the screen goes, common sense will tell you what happens if the screen gets impact damage, and with internal pressure from a failed battery the glass is unlikely to be stronger than the metal body so it is obvious where any failure will show up. The only way they can make the screen "not the weak point" is to increase thickness until it is stronger than the watch body, at which point the touch screen will probably be unusable and the watch will be much thicker, maybe double the existing size. The other option would be to switch to a plastic screen but I remember the screaming customers in the early days of smartphones demanding glass screens because plastic felt horrible and scratched easily. Only glass was acceptable, plastic was for third world and kiddie phones.