I think the issue has to do with West African and Caribbean drumming patterns. Drumming patterns are the rhythmic root of a song. And many West African and Caribbean drumming patterns can be interchangeable, which speaks of their close cultural connection.
But to African American ears, the drumming patterns don't really come natural to us. Our rhythms are informed moreso by the boom bap hi hat that is the rhythmic root of a lot of hip hop music. And rhythmically there is a difference in the boom bap hi hat and afro-caribbean drumming.
It's one of the reasons why I couldn't get into reggae because the rhythms we're repetitive, boring, and not complex enough for my ears and I think for many African Americans, Afrobeats is the same way. We zero in on the drumming pattern (because it's noticeably different from the boom bap hi hat that we're accustomed to), without really noticing the other instruments and how they contribute to the sound.
I think on both sides, because we're so used to our respective percussion rhythms, we don't really pay attention to them in our music because they make up so much of our musical sound. But when confronted with others, we tend to notice and zero in on the others more. It's more pronounced.
I'm pretty sure the boom bap hi hat, central to most hip hop songs, makes hip hop sound repetitive and the same to Afro-Caribbean ears.
South African rhythms are a bit different however. The drumming is a bit more complex and add to that the incorporation of Afro-American derived House, their music comes easier to our ears.
I personally love Afrobeats so I don't have a problem with it. I tend to focus on the melody, singing, lyrics. Couldn't stand reggae growing up with a few exceptions. So I'm only speaking on what I perceive to be the same issues that I had with reggae, that other Aframs may be having with Afrobeats.
And I'm very aware Afro-beat rhythms are diverse and complex. But those who only hear the mainstream songs may not be aware.