I have no sources on hand and no desire to find any, but I think that OW2 was a partial refactor of OW1, if that makes sense. They'd always planned to sunset OW

I have no sources on hand and no desire to find any, but I think that OW2 was a partial refactor of OW1, if that makes sense. They'd always planned to sunset OW1 for the release of 2. Ages ago, there was a large update to OW1, which I believe had something to do with 'readiness' for OW2 in the form of major engine changes, etc. Nothing was really new after that patch, but it was massive, and may have actually been a full reinstall. Memory is flaky there, and I don't want to look for details while at work. I'd bet $1 that the megapatch (and patches since) would have been designed with OW2 in mind, since OW2 took a long time in the oven. Extrapolating a bit, I think of it as running the OW2 engine in OW1 compatibility mode, or something.