Ever since the update, my team sucks

[cookizzz]

Actually no, they are exactly the same difference -- a difference of 5 quality points per 20%. That part is a linear relationship.
Now, the relationship between quality/stat points to actual performance could be non-linear. So a 60% team may do worse against an 80% team than an 80% team do against a 100% team. That part is unknown and probably involves too much noise from the random number generator.

But the percentage is introduced to spare some managers from getting headaches for translating the numeric quality value to their current level's five-star standard.

A 23% difference translates to about 5.8 quality points difference. The poster's team was labelled as the favourite and still lost.

I am sorry if I make mistakes because I have not used current version for a long time. Probably I'm wrong but I don't feel that the relationship of star/quality points/percentage are simply linear. Moreover, since implementation of current version and introduction percentage, I am no longer able to exactly predict the quality point that players will add a new star. Even if relationship of quality points and percentage are linear, the line has been shifted since that moment. For example, I may think that a player will turn to six star at quality exactly 180 according to traditional experience, but he may turn to 6 star when he still needs 1 to 8 more sp to be 180q. That greatly confused me and was the third reason I completely gave up using current version. (BTW, I am not sure if the quality point as shown in old version is exactly the same as that in new version) As I understand, users of percentage do not feel such problem because 100% is always 6 star line.

Sorry again if i still have many misunderstandings. But I will not further study percentage as quality representation in current version and will not border current version users by making similar incorrect analysis on this.