Before you logically conclude that investing via a direct plan is the smarter way to go, hold on. Cheaper is not always the better option.
Even if you follow the strategic rules of thumb: prepare an asset allocation, diversify, and think long-term; there are thousands of schemes on offer from approximately 44 asset management companies. Are you capable of differentiating between all the schemes in the industry? Even so, you will need to put in time and effort to research and create a shortlist of schemes.
In most cases, new investors with little investment experience end up choosing the wrong scheme, unless if you are a do-it-yourself long-term equity mutual fund (MF) investor, you want to buy a fund at the lowest possible cost and then hold it for as long as you need to.
One reason to go direct could be that the adviser you choose operates as an RIA who charges an advisory fee and uses direct plans for client investments. It would not be hard to gauge that the extra cost which is paid in the form of fee to the RIA more or less exceeds the amount you intend to save by investing in a Direct Plan.