Bitcoin is very easy to understand, the problem is people are waiting price to reach its all time high price and when price reached maximum then they start investing in bitcoins and faced huge loss and then say that bitcoin is risky and difficult. Simple rule buy at low and sell at high!
The difficult part could actually be that angle where people think they can study and understand the market to know the right time to buy and sell, but that's not as difficult as the OP makes it seem, where I see it coming from understanding the technicality of bitcoin, which requires extra work to learn and understand that part, which, without paying much attention and sacrificing your time to achieve that, will actually appear to be difficult, which is why only a few are interested in that part of bitcoin.