Do the smart phones are suitable for replacement with computers (PC?

defenintly the differences between smartphones and computers are fading away day by day, but as far as i am concerned computers  cannot be replaced smartphone at present conditions.......and another thing is it depends on the use .For example if your need is to watch a movie or read a PDF file or use internet , then smartphones are sufficient 

but when the level of use increses , smartphones becomes weaker, for example high end softwares like photoshop , autocad etc cannot be used fully on smartphones