Hey guys. Question time.

Im thinking about going up to 19" alloys from standard 18". I just went to get 4 wheel Laser alignment checked and mentioned that I was planning on going up. They guy said he would not recommend it as going up a size will mean a reduction on tire size making it easier to crack a new alloy as less tire on it to protect it. Plus he thinks it would be a less comfortable ride with less rubber on. Im currently running 235/40/18s. is this guy talking sense or can anyone who has done this say otherwise.

Thought id ask before spending lots of pennies....