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Wow, I hope not. I would never render out a MPEG-2 codec directly out of AfterEffects. Way too lossy. Too hard to edit with.
On the Mac side, the XDCAM EX codec is a Quicktime component, so any Quicktime compliant application (like AE) can import/export EX Quicktimes. But I always convert my EX footage to ProRes422 before working with it.
Why I hope not? If you don't want it, you don't have to use it. It's not like the FCS Quicktime codecs won't work anymore.
The XDCAM Quicktime components are the same thing, but with the extra step of re-wrapping the files.
AE always processes as uncompressed 4:4:4, so while there can be an advantage in terms of responsiveness when converting to ProRes, in quality terms is slightly better using the native files than converting them to a visually (but not mathematically) lossless codec.