You're not the first person to make this point. While there is nothing in theory about filling a bunch of 100 mL / 3.4 fl oz containers in your 1 L / 1 qt bag with whatever liquids you desire, the TSA has mentioned multiple times that it would take a lot more fluid in aggregate to be a problem. It is because of this logic that one can fill 10x 100 mL bottles for a total of 1 L of liquid but can't bring two 500 mL water bottles through the checkpoint.

Furthermore, Kip Hawley has said that the technology is in place to test liquids everywhere, but the TSA doesn't have the desire to do the extra work necessary to test the liquids in addition to the revenue protection model that has been in place for the last six years for the post-security vendors. I'm assuming the test for liquids would be an ETD swab, similar to how medical and formula liquids are tested now.