We're running into many problems, so we're going to disable it for now. Once we've done logical mode, we will consider re-enabling it.
See: Crashing the metal compiler process: https://bugs.webkit.org/show_bug.cgi?id=198414 Myles also generally ran into issues with respect to pointers on some GPUs: https://bugs.webkit.org/show_bug.cgi?id=199012
Not happening.