Experience and shitstorms talks.
Remember the past, when assists on SEG never worked until people got tired and they should put them working (and they wanted a 300 SEG cap for Kanae at 2nd EG). The announce on eGacha also was product of another fiasco.
And now i see a factor, people (between free and paid users) with more than 1M SED. For chicken players a zero rate of SEG can be an advantage (saying this when i saw 11M Kasumi when i was 90k), the issue could be with the rest.