I don't understand what you're inferring this from. To me it looks like the opposite is happening and dead space around elements is increasing (e.g. see the com

I don't understand what you're inferring this from. To me it looks like the opposite is happening and dead space around elements is increasing (e.g. see the comparison of finder between 10.16 and 11.0). Edit: It's also quite clear from the comparisons that the number of elements visible on-screen is decreasing because each element is getting larger and the padding between elements is increasing. Edit2: Also, the idea that this UI is more accessible is contradicted by the removal of various visual elements that help separate and differentiate UI elements and the loss of contrast in the UI in general. Visual impairments are much more common than Parkinson's and none of these decisions help with that.