Why spot chart takes all the lime light

Is it correct to say that Nifty Spot is the ‘underlying’ for Nifty Futures & Nifty Future is the 'underlying for Options ? why do we use spot chart for level marking ? If one can mark on Futures chart, would it not be easy to trade directly on the chart ? ( any other reason than the short span of 3 months that are futures enjoy)

Nifty Spot is also an underlying impression for the 50 stocks in it!
Nifty futures chart are little distorted than spot chart and are just likely to follow the Nifty Spot, that is the reason we use Spot Chart.
And nifty spot is also the most accurate as premium is not there, unlike futures.