I do agree with how long-term investment is better for the vast majority of people, especially new ones, if you're capable enough then taking the risks of short-term investments instead would probably prove to be the best. Not to mention that long-term investments have a different type of risk compared to short-term ones, wouldn't really call it less risky but rather there's just more time for you to manage your portfolio since it's for the long term.
* Easy - So, because it's less stressful, this kind of investing is easier, you don't need to be an expert or a good trader. You know how to analyze, signals, charts, and more. That's why you don't need those because you will only invest once, or if you always do something simple and that is just buying buy.
I reckon you still need some semblance of being a good trader, you are still going to understand what the investment you're going for is about after all, and whether or not it would actually last that long for your investment to bear fruit.