As long as free fizzy drinks are considered sacred, engineers will never reach the income levels seen in the legal, medical and financial sectors. Employers will treat like adolescents those who behave like adolescents.
It allows them to start a patient on a drug without friction, or to give a patient who's going through hard times a full course of treatment without him having to pay anything.
But if a company had been providing them and stops for petty reasons, that's a red light, not because of the drinks, but because of the petty reasons. It can very well be an early warning of incompetent and irresponsible management.