The biggest hurdle with Zerodha Streak or OnlineAlgoTrading platforms is , u can not put ur custom (complex) strategies into action.
Like if someone is calculating a whole different indicator (which is not available in the list). And one wants to trade using that indicator , its impossible as of now. Thats where Amibroker or any other platform (even trading view) is more helpful. One just cant trade simple crossovers forever