There's no perfect application or system.
If I can think and give one of it,I'll choose to say that the flaw of it is that many are not accepting it and are still skeptic about it.

A lot of reason why we don't need to invest in bitcoin since investing requires patience and if we are too emotional and don't have enough patience to wait for the right time to withdraw then we should not invest in it especially when we do have lack of time.

In the world everything goes through a loop. Now the market is less than in December 2017 onwards, but there is no eternal growth need and correction that we are seeing now. Soon new heights, fasten your seat belts)

in fact, there are still many people who are skeptical about this. that is, they are afraid to take risks, because a lot of experience from people who invest in bitcoin, and the price is down. well, but bitcoin is created for people who dare to take risks.

yes, you are right, they cannot accept something new especially in the technology section so they just don't care about this and abandon until they realize that actually, they can use the technology to themselves. but I guess when they realize about this, it is too late for them to get involved in bitcoin industry because, in that time, they found that the price is too expensive and to earn with freeway it's really difficult to do.

maybe they just afraid because of many people around them telling that don't use bitcoin, it will make you lose your money in any second, the price is too volatile and it's too dangerous for you and bla bla bla.

they can't acknowledge something new particularly in the innovation segment so they simply couldn't care less about this and relinquish until the point that they understand that really, they can utilize the innovation to themselves. however, I think about when they understand about this, it is past the point of no return for them to get engaged with bitcoin industry in light of the fact that, in that time, they found that the cost is excessively costly and, making it impossible to gain with expressway it's extremely hard to do.

For me I don't have reason why not investing in bitcoin because bitcoin is good coin bitcoin is going down but this not a reason why you should not invest it .

Of course

I see no reason for not investing in bitcoin. Bitcoin is the future. In just a few years, we will be just ridiculous today's fall of bitcoin and the entire cryptocurrency market as a whole.  Sooner or later, the price of bitcoin will exceed a million dollars.