Just not true.
Here are some numbers. First, to compare WM to the market segment it's placed in and that is Automotive Aftermarket. For the last five years WM has averaged a gross margin of 29%, a pre-tax profit of 1.8% and a net income of 1.1%. Looking at those same three numbers, Autozone has 52%, 17%, 11%, O'Reilly has 52%, 18%, 11%, Advanced has 46%, 8%, 5%. Clearly gross margin is where they are short as their operating expenses are 27% vs 35%, 34% and 38% for the others. Now, Internet sales generally run around a 33% gross margin, a 3% pre-tax and 2% net income but on far greater volume. Amazon has a 37% gross margin, 2% pre-tax, 1.7% net.
So, the problem is that WM doesn't have adequate gross margins for their market segment. Apparel was their effort to get them as retail apparel averages 51% gross margins. Clearly WM has to figure out a way to negotiate with vendors and choose alternative vendors and products to get costs down and margins up as they can't do it by raising or even maintaining prices. This has been their emphasis on private labels but meanwhile they're getting destroyed on branded items. Their other approach is larger stores with a lower expense ratio which allows profits at lower margins. All these are challenges and they may or may not be successful.