I quote this all the time to people. There’s too much, we’re spread too thin. Ignorance shouldn’t be considered a big deal or a huge embarrassment. Not being ready to learn is a problem, but ignorance is sort of the default state now.
For example, think of someone who is ignorant of the cultural practices of a certain minority of people despite seeing members of this group every day in their neighborhood, this tells me something not so positive about this person and how they view the world and other people. However it is never too late to change, either.
You're correct it's not the end of the world, but you'll need to catch up quick once you realize something and maybe even completely rethink plans. This isn't always a bad thing and the stuff you come up with from ignorance might be useful in other ways.
In my opinion, ignorance is just a fact of life. Too much of it can be a disaster, but just enough can spark meaningful creativity. Often times though, it's just something to immediately move on from because you have way more other stuff to do.