I know maybe the opions here are to extreme, but in my eyes the advantage is to big from the teams who finished first/make it to the finals compared to the 5th placed teams
If you are talking about the point of view that you can train during scrimmage whatever you want, thats why I can see 1 scrimmage in advance after 1 PO match as a contribution. You didnt do whatever you wanted in the PO match, maybe you did, because you knew about that there is not much chance to make PO finals..
So afterall - winners will be only these who make a PO finals and losers (from the training perspective) would be only these who tought that will make finals and failed.