Hard to find what it really does but I do know what DCM is in telecommunication. It means Dual Carrier Modulation. To stay simple, we use signal modulation to transfer information. DCM can be seen as an enhancement to conventional QPSK modulation that expand the coverage and robustness of an outdoor hotspot. https://www.ekahau.com/wp-content/uploads/2017/03/Webinar-slides-802.11ax-Sneak-Peek-%E2%80%93-The-Next-Generation-Wi-Fi.pdf Not a good idea to remove this unless it only impacts samsung apps. Need testing.
Phones target this application