Some daylily seeds will germinate right away whatever the foliage habit of the parents and yes there have been studies on it from that perspective.
One might speculate that lack of seed dormancy in a whole batch relates to other factors such as the climate the seeds matured in (and the time of flowering), unintentional stratification, seed dormancy wearing off during storage, or whether seed dormancy has been selected out by a hybridizer. There might be other possibilities that aren't coming to me right now.
By selected out I mean that some people only keep the first seeds to germinate thinking that later ones are weaker (not understanding the concept of seed dormancy), or just don't bother to wait for the later ones, or assume they won't come up. Someone who stratifies is not selecting against seed dormancy.
Edited, forgot to say that no, germinating right away does not necessarily mean th seedling will be ev.
