Because that's not what a CEO does in any case. At this level of management, especially in those huge company, you are so far removed from the craft that it is really irrelevant if you have any experience in it.
I think, it is way more important to look at the actual owner of Boeing and its general environment. Boeing is now mostly owned by big institutional investment firm [0], and they are the one who choose the CEO.
Boeing is also one of the most insanely protected company in the U.S. Whatever Boeing does, the U.S government will always be here to make sure Boeing stays dominant and make life very difficult for any competitor.
The situation with the 737 Max was actually a good example where the FAA and the U.S Govt was again very lenient with Boeing, and just gave them a slap on the wrist. So if you were the owner of such company, why not abuse this amount of protection ? Why not push for the maximum profitability at the cost of quality ?
If Boeing received more than just a slap in the wrist for the previous 737 Max fuck-up, they would be way more inclined to reevaluate their whole quality process and make sure no incident every happen.
[0] https://www.investopedia.com/articles/insights/052116/top-3-...