Earlier quoted context omitted.
What value is an opinion if you can't back it up?
David Hilbert published a list of 23 open problems in mathematics near the turn of the 20th century, and they served to goad the mathematics community into action for the next 75 years at least (some are still unsolved, but most were solved). Saying "this is a problem that should be solved" might betray a lack of knowledge of an existing solution, but hand-waving such an assertion away and saying "he can't back up hi…
The author of this list specificly states that they are problems that should be easy to work on. That's very different. Most of the ideas are ideas that have been done in the past. Some are just bad ideas, others just didn't catch on, perhaps due to chance or fashion. None of them really have compelling stories behind them.
There's millions of things in the world that could be solved. A list of some subset is boring. The "Why" is the interesting part.