1) Supported by Lensrentals repair data.
2) Less cost to produce – no guarantee that gets passed along to customers.
3) The smallest possible size (small body, pancake lens) is smaller for MILC than dSLR; small bodies present ergonomic challenges as lenses get larger (the new Sony 24-70/2.8G is bigger than its Canon equivalent).
4) More lag even with the fastest refresh, but the additional display options are great
5) More accuracy, but not necessarily more precision or faster AF b