I open a bunch of files.
I'm jumping around.
I'm listening to selections.
I'm copying selection ranges to new files.
I'm making a whole bunch of cuts.
I'm closing files and cuts I no longer need.
I'm jumping, listening, closing. editing, jumping, copying. Doing stuff.
You've inserted a new step right into this middle of this workflow which accomplishes absolutely nothing except to slow me down:
I can no longer right click a file and press "Close Files" if playback is engaged.
The "Close Files" context menu entries is now grayed out for no reason.
Who cares if playback is on? I want to close the file. I just *listened to something in it* to find out that it's one I don't need anymore.