Mike,
I'm glad that you posted, as I just got handed my first MKV file, and was heading off to find a converter for it.
The downward spirals to those other files usually came from demands that Adobe include native, two-way support for MKV. Then, the next 20 replies would either poo-poo the merits of the format, or tout its attributes. Few ever discussed how to handle the material, outside of saying that it was Adobe's responsibility.
Glad you resisted the urge to just head down the hall with your knowledge, and decided to share it. Just as with most of those old threads, I have no feeling, one way, or the other, as I had never seen MKV, or been asked to output to it. Suddenly, I found myself having to deal with one, and was headed to those old threads, in hope that amidst the clutter, I would find what I thought I needed.
Appreciated,
Hunt