PN;
Sure, when too much salt is used, the fermentation rate is dramatically reduced, with the end result of the dough receiving less fermentation in any specific period of time, hence, the dough is underfermented (even though the dough might have been fermented for the correct period of time), and it is this underfermentation that is responsible for those blisters and bubbles forming on the top of the pizza during baking.
As for the starchy taste with insufficient salt, that is primarily the result of the typically lean dough formula used in making pizza. By “lean” I mean it doesn’t have copious amounts of butter, sugar and eggs along with other flavoring materials. So, in the case of pizza dough, the flour has a major influence on the flavor of the finished crust. If you look at the composition of flour, you will see that it is roughly 75% starch, the rest being protein, water, and minerals. The salt brings up the “other” flavors present, like those from the added oil (olive oil), protein, and those developed during the fermentation and baking process. These other flavors cancel out the starchy flavor to give us that plesant fermented flavor that we look for in a great tasting pizza crust.
Tom Lehmann/The Dough Doctor