he only disadvantage of investing in direct plan mutual funds, is that it causes discomfort to commission agents!
One myth propagated by the commission lobby (via media) is that an investor is left to invest on his own with no body to help . This is nonsense.
While investing in regular plan funds through a commission agent will incur about 1.5% commission, going through a SEBI Registered Advisor will result in 0% commission. Of course the RIA to survive will charge a much smaller fee than the commission that you save.
There are many platforms that help an investor choose the best funds and also help invest in them based on their risk profile. Jamāwealth.com is one such that helps you with fund selection, risk profiling and a host of features like family portfolio, systematic plans etc. (disclosure: I work for Jamā).