The phrase "a main flaw of" is correct and usable in written English.
It can be used when discussing a significant weakness or defect in something, such as an argument, product, or system.
Example: "One main flaw of the proposed plan is its lack of consideration for potential environmental impacts."
Alternatives: "a major weakness of" or "a significant drawback of".
In a nutshell, the main flaw of Ryan's position is that it ignores that the difference between the population on Medicaid and the low-income population without it is that the latter group has no insurance.
The main flaw of "Saved," though it sounds a bit trivial given what the humans in this show have gone through, is that we don't see enough of the animals.
In fact, the main flaw of Halcyon is that it occasionally feels a bit too much – and that's something Goulding, perennially painted as the timid type, may not be so sad about.
Indeed, the main flaw of the book is Arledge's unwillingness to get inside his own head.
Jokey detachment was the main flaw of this generally lively and well-rehearsed production, directed by Tara Faircloth.
The main flaw of Zebrowski's book is its failure to capture the lives of any of the eruption's victims in enough detail to let readers experience the true depth of their terror and grief.
Updated at 11.58pm BST 11.55pm BST Rays 1 - Red Sox 4, bottom of the 4th The main flaw of the Tampa Bay Rays is that sometimes the offense devolves into "Evan Longoria reaches but doesn't get nobody around him does anything".
The main flaw of the 96-page report is its focus on copying the strategies of new media upstarts, most prominently Buzzfeed and the Huffington Post, instead of defining how The Times can exploit its extraordinary assets to create a focused and original online business of its own.
The main flaw of such measures is that they only reflect the global effect of errors while ignore the temporal distribution along the time axis.
The main flaw of this study was the use of the solvent dimethylsulfoxide (0.15 %) above the OECD-recommended concentration in test controls and treatments, and the relatively high concentration of 4%% formaldehyde as a disinfectant for fish eggs.
