I don't have time to list them all.
The biggest technical issue I see is the computing requirements
The biggest economical issue that it isn't backed by anything, be it force, inherent value or inherent utility.
The closest thing to backing Bitcoin has are it's software developers, which aren't that rare.
Just curious before I finally ignore you once and for all --->
at what point would you, theoretically, admit that bitcoin is here to stay and will have an important part to play in the world? What would it take for you to admit this, most importantly, to yourself?
If you can't answer this question then you really haven't thought deeply on the topic and are just the forums longest surviving troll.
Once Bitcoiners begin resembling a militant group....
then it can at least be backed by force.