I believe there is no one size fits all solution here, as some will prefer the old method. I guess ideally would be allowing to choose what you want to see.
The old method's weakest point was the fact that the stats reset after leaving the losses screen for the first time, so if you made some attacks first they were then missing from the stats for the rest of the turn. It was absolutely not a consistent experience. So this had to go.
For me the numbers only from my turn didn't make sense, because they didn't show the exchange ratio (crucial to know if you're above or below the desired ratio in terms of men & materiel), the Germans could have reduced pocket that cost me 100K, yet on my "current turn" stats that would never show up. During my PBEMs I never looked at current turn losses, but painfully copied total losses to excel to substract previous turn total losses to get my "one turn" losses and find what the exchange ratio was.
If I could fit 4 sets of data into the structures available it would be possible to make a dynamic solution - record losses from both logistics phases and both turns separately and add a button to display all combinations of these that make sense. Unless I know I can get more space I'm afraid the current solution is the only one that will remain, offering consistent experience for both players, regardless of when they enter the losses screen. I could try to dump this data into logistics phase log, but again - it's restricted in size and I have already pushed it to the limit.