Because it’s crazy. It’s insane. It will never work. You’ll hear this a lot if you have a lot of far-out ideas. “Moonshots” is the term I prefer for such ideas, or a really big swing.
And then in an instant he realised that rather than building a cable through the wildernesses of Newfoundland and Nova Scotia in the hope of saving a couple of days’ transmission time for the telegraph, one could build a cable directly from Newfoundland to Ireland, under the narrowest point of the entire Atlantic Ocean. If he was able to do that, it would reduce the time for a message to pass between the two greatest cities in the nineteenth-century world from a matter of days to just a few seconds.
~ from, https://www.slow-journalism.com/app-issues/the-death-of-slow-news
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Why not, indeed. Because what if your idea actually worked?
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