It's true for almost anything.
The world isn't divided between thinkers and doers. People who believe that generally see themselves on the thinker side, and they don't want to do, so it's a narrative that fits them well.
In practice, I've met very few good thinkers who weren't also doers in one way or another, simply because it's very hard to actually have good ideas if you never got down to implementing them. An idea can feel good and sounds great, but if you don't have the experience in knowing what works and what doesn't, how to see and deal with edge cases and exceptions, it's probably not that great - or, put another way, you are probably not a good judge of its greatness.
And that's the biggest problem with the "lets reinvent the world" crowd - if you don't know how the world works, why it works, and if you never actually managed to reinvent anything in your house, in your community, in your business, it's quite doubtful your great idea to save the planet is actually interesting. And it's also why so many of the world's doers seem to do so often the same things, and take the same decisions in front of the same situations - not because they are stupid and ignorant, but because more often than not, they already figured out what works and what doesn't, and the difference between what they can dream and what they can accomplish.