Lets say in theory someone is creating a bitcoin/altcoin trading website/app.
What would make it perfect? How could it better than the sites we already have?
There is no perfect trading website. All the trading website right now looks good to me.
However, to have a good trading website that a lot of traders/investors will used, you need to be open up for suggestions that will make trading website "perfect" in your customers eye. For one, graph needs to be accurate in real time because some of us are using it to make decision on whether to sell of buy. Also, a good API that will facilitate information sharing including real time price or even trade execution. This is some of the thing I have right now. Goodluck.