The biggest disadvantages from bitcoin in my opinion is still vulnerable hack and bitcoin is always used for the negative activities. That is seems to me that the weakness of bitcoin makes someone difficult to believe with bitcoin.
That is one of the things that could prevent bitcoin to be accepted as payment. In addition, many scam it will affect my opinion. If bitcoin can be overcome, I believe bitcoin will be accepted as payment.
When you deql with bitcoin you just have to know that there are risks anyway.
In other words, bitcoin is a currency with no concrete thing to hold i.e. paper money or coin or in other way bitcoin just exist in a cyberworld which most people doubt so much as its reputation became so bad from the news they have heard from hacking up to scamming. And also everyone in the cyberworld is hard to identify whether they are real or hiding their true identity -- a freedom of being anonymous. So we can say that the biggest disadvantages of bitcoin is earning the trust of most of the people especially those who are afraid to risk (that is me before I joined bitcoin).
Second, bitcoin appear to be complicated at first glance (this is also me as my friend encourage me in joining bitcoin) because it has a lot of technicalities. But when my interest regarding bitcoin drives me out, I began to enter it and ask my friend like "what is this address that this site is asking me to give in order to withdraw my bitcoin" a simple question of a beginner from the perspective of an experienced ones but a confusing thing in a beginner's perspective. When I've learned what is this address in the bitcoin world, I was like "Ahhhh so that's it? I thought it was something rather complicated or confusing." I guess you get my point there so I will not elaborate it more.
Next might be people finding it questionable. It's mysterious without enough knowledge of what really is bitcoin but if that person is an eager one to seek an answer for his questions then he will came to know its wonderful world but still questions continue to rise. We can see this like our world, people came to know a lot about this world whether its round but soon as they know it they began to question again, a much harder one, "does the universe extends infinitely?". My point is that as long as there is curiosity together with interest, this disadvantage might become a great advantage.
So here it is my top 3 biggest disadvantages of Bitcoin as for a beginner's point of view. As you can see, those aforementioned were my personal experiences. Sorry if it appears to you that it is almost self- centered post of mine but I wish my point here isn't blurred by it
. And I hope that you relate with this since all of us started as a beginner, starter, newcomer, newbie, rookie or anything you can add similar with this. And yep, even though my questions were answered, there is always a new question and some of this question might be left unanswered like how our the life of humanity, of everything begun.