I don't agree with this unless I can see more examples. As far as I can tell there is only one serious misinterpretation and it is with driveclub. The problem is not caused by the DLC separation rules but by a conscious decision to classify the disc game as the main game instead of the PS+ edition. Now let's not get discriminatory about whether PS+ users are subhuman or not. The fact is the game was released with a simple version and a supplemented version and the supplemented version has been chosen as the main game/base game for reasons unexplained.
The rule in question is an exception designed to normalise ratios for games which are confirmed to include DLC, such as TLoU remastered, sleeping dogs definitive edition, etc. It helps for things like grounded mode in TLoU which will only be counted as owned once you've already beaten it, which makes the stats terrible. (15% on PS4 vs 99% on PS3- and PS3 was the one where you had to buy it).
It also helps that, as far as I can tell, every game treated in this way has the DLC on disc.
The thing that makes this system imperfect is that it won't always confirm that you own stuff even when you do, and this applies to PS3 also, when buying GOTY editions or game bundles (Flower, FlOW, Journey PS4). Therefore it has only limited accuracy.
If you really wanted a best of both you could re-separate the DLCs but make them have the same ratio calculations as if they were in the base game (similar to title update handling but not even requiring any download). This would allow people to get more completions, but is that really the issue here?
The two problems with this is that people can once again ignore DLC which they clearly do own, and also it would not fix the driveclub issue at all because the ratios would still be over the top since the whole point of the debate is that this assumed ownership is NOT CONFIRMED and that IN REALITY the statistics show it to be more wrong than right.
The real solution is much less of an overhaul, simply move the assumed line of ownership to dis-include the supplementary complete-edition exclusive trophies. The only reason that the DLC is included in the previous examples is because they are the only version available so it can be safely assumed they are included, but that is simply not the case here.