I understand the performance concerns.
However, due to some features HM lacks I need to import hands in parallel in both HM and PT2. With this feature on, I cannot do it.
I used to have HM run and just import hands and then PT2 run in parallel and import hands and move them to another folder. Now obviously HM will move the hands too so PT2 cannot grab them.
And I cannot set the PT2 to grab them from the HM archive folder because they are now in a different format (for example in the case of OnGame which originally uses a DB) and PT2 won't import them.