I have noticed some severe pathing issues when I played. I went single player vs AI because I'm too scared to go against the others that have been playing longer than I.. ie more than a day or two.. lol The AI throws bomber after bomber after bomber at you.. so I had a bunch of debris around. Everything was having issues getting around the bomber debris. I don't think debris should effect pathing.. as in.. players forces should be able to drive right through it as if it was not there. I also noticed that if you build two tech two plants one above the other.. the one top one will not know where to put it's building units (since they normally exit out the bottom).. so they kind of go into limbo. -Devoh
Debris and pathing around them was actually a huge part in TA when wreckage eventually blocked the pathing through the battlefield. I am pretty sure this will stay. It is still problematic though as units tend to get stuck in debris.
That's one of the uses of reclaimation. Set an engineer to patrol your base - not only will he automatically clear the debris, you get metal from it too!