I am going to enjoy myself a little and complain. I hope this kvetching provides you with some amusement. I hate the following idiom.
According to linked Perplexity search above this phrase has come to represent good & useful innovation.
This is wrong. Sliced bread is not a good innovation. It’s barely a useful one
Sliced bread is bad. Increasing the surface increases the pace at which bread goes stale. Any convenience brought about by having a slice on hand and saving a minute or two of time is undermined quickly by having an entire life of bread go bad more quickly.
When bread is baked, the starch molecules in the dough undergo a process called gelatinization where they absorb water and swell up. As the bread cools, these starch molecules start to recrystallize and firm up again, causing the bread to become stale and hard. Exposure to air speeds up this recrystallization of the starch. An unsliced loaf has just the two end surfaces exposed to air, acting as a protective barrier. But when you slice the loaf, you create many more exposed interior surfaces that allow air to penetrate and cause faster staling.
Maybe Americans are so accustomed to dough softeners and preservatives in our store bought packaged loaves that we’ve come to expect our slices to remain as soft and pliable as within the hour of its baking. If you are baking fresh bread without any of these miracles of foos science you can expect those slices to be stale by the end of the day.
I’ll grant you can expect a fresh loaf to go stale within a day or so. But if let the loaf remain intact you rather than committing to slicing at the bakery you could get another meal or two of slicing.
Slicing reveals the soft crumb within that has been protected somewhat from the light and oxygen of the outside word. I’d like to put off the time for French Toast and croutons personally. I can’t eat an entire loaf in a day.
If bread is sliced at the bakery you’ve committed yourself to eating the entire loaf more quickly than it goes stale. At the end of the day you’ve got bread for for nothing but toasting or soaking.
So please stop using this stupid idiom. We have so many useful innovations at this glorious moment in our species history. Why compare the advent of artificial intelligence or the rapid advancements in medicine, materials science and engineering with an objectively innovation. Sliced bread is a good thing on one or two axis of improvevent at most (time and mess) and a distinctly bad development in all other crucial aspects.
If you must know this rant was prompted by me ordering a loaf of bread from a bakery which sliced it without asking. Neither photo nor written description indicated they would do this to my bread. It was not preference. I wouldn’t have bought it if I knew they’d mangle its future use. Also what kind of bakery slices a ciabatta? Civilization is lost on the continent.