Moving parts typically reduce a smartphone's structural integrity and its durability, which is something that Zack Nelson on his JerryRigEverything YouTube channel regularly puts to the test. The Xiaomi Mi Mix 3, with its magnetic sliding mechanism, has now been subjected to Zack's scratch, burn and bend tests.
https://www.notebookcheck.net/Xiaomi-Mi-Mix-3-First-slider-phone-survives-durability-tests.395231.0.html