Sure, since you can view the list of stocks & weights of a smallcase, you can buy the individual stocks/ETFs on Kite.

Other than the time taken to punch in 15-20 individual trades to buy it, the added convenience of managing a basket of stocks as a portfolio is only available when you invest in smallcases.

For example, if you have to rebalance the weighting scheme of your smallcase, you will have to calculate what's the allocation required and buy/sell some stocks individually through the trading platform. 

Also, here are other features as to why investing as a smallcase is better than investing in the same individual stocks/ETFs over Kite.

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