It's not like "innovation" exists in a vacuum; if I figure out, I dunno, a new motor design for an automatic head scratcher, there's no reason that it can't later be used for something you deem to "add something significant to humanity".

Also, who gets to determine what actually adds to humanity? If you really didn't like scratching your head, or it took you a really long time to scratch your head in the morning, then wouldn't having something automatically do that for you be useful?

Travel websites are an example of something that did solve a problem; despite what you said before, people didn't like having to deal with travel agents (I googled around); they didn't like having to book tickets during office hours, they didn't like how hard it was to compare prices, they didn't like how much of a cut the agents took, etc. Buying tickets online save consumers time, money, and probably helped businesses book flights more easily. Businesses that "add significantly to humanity".

I know you didn't say this, and I'm not trying to put words in your mouth, but I think that the binary mentality that you either are working on "useless" or "revolutionary" things is really harmful. I think it puts a lot of pressure on newbies with the thought that they have to change the world, and they might withdraw from STEM stuff because they don't feel like they're making significant enough contributions.