I have no problems believing and accepting that f228be is better speaker than f208 and I wish I could afford it or at least had a chance to listen to it. My mere point was f208 does not give me fatigue unless on problematic records that is
fwiw do not have any listening fatigue with f208 on properly recorded material. some tracks/albums are almost unlistenable even with eq though but I believe it has nothing to do with the speaker
Tbh do not really care about the reasons. See also https://www.audiosciencereview.com/forum/index.php?threads/how-important-is-good-speaker-design-if-you-have-digital-room-correction.18707/post-612462
another interesting option might be "dialog lift" (or whatever it's called) for those having their center channel low on the floor. I like what it does on my Pio with FH available