So Windows users can run Ubuntu in your little VM and that Ubuntu can utilize DirectX without any issues but not real Linux machines.
No, I don't think this is laziness but a well planned step. We get it, you don't wanna lose your gaming marketshare. After all, you're the main player even with a bloated and anti-consumer software like that but know that Linux is inevitable.
Maybe not today, but the better software will win. No matter what your opinion is, FOSS is coming.