Some developers don't even know what MySQL storage engine is, and they don't need to know that today because the decision on what to use is made for them by framework developers. For example, Drupal uses InnoDB for its tables. It was not always that way though. I remember the time when we had to convert Drupal 5 tables into InnoDB on a site with intense load. It was so long ago, maybe in my previous life.
Until today, I thought (or I wanted to think) that all modern PHP frameworks use at least InnoDB by default (there are newer storage engines). It turned out that I was wrong. Today I noticed that tables of the Laravel 5.2 application I worked on were in MyISAM. You can’t even imagine my confusion.