You should provide your input to the thousands of engineers across all automakers who have been designing millions of stop start systems for decades! I doubt they thought of that.

Does it really? Say that you have a fully warmed up fuel-injected engine that is shut down for 30 seconds at a traffic light. I doubt that 30 seconds is long enough to allow a critical amount of oil to run off of lubricated surfaces, and fuel injection would minimize the washing down of cylinder walls with excess gasoline during the restart process. 30 seconds is not enough time for the engine to cool down to any significant degree, so the clearances between moving parts won't significantly change.

I would be surprised if a modern engine would be materially affected by a few extra starts during the day. I have noticed that the stop/start process will not be initiated under certain conditions, and I believe that a cold engine is one of those conditions.

I can't imagine it hurting the engine.