Those that actually own foldables and use them everyday will attest to the crease being the lowest priority. Apple should focus on:
Software
Thinness
Weight
Camera quality
IP rating for dust/sand
Apple Pencil support
Durability
Battery life
Nail down all those other design challenges before worrying about minimal crease.
People that complain about the crease typically lack any real-world experience with a foldable (as opposed to a flip phone). People imagine they'll feel the crease every time they swipe or scroll because they're used to how their thumb or finger slides across the middle of a narrow slab phone. What they fail to realize, due to lack of first-hand experience, is the wider inner screen of a foldable makes it difficult to reach the middle where the crease is. In reality, with two-handed use your thumbs are scrolling along the outer third of the large display and rarely encounters the crease. That is why so few foldable owners actually complain about the crease. And when watching content on the glorious, large display, the crease is literally invisible. The crease is there if people want to fixate on it but that's like going for a run and realizing your socks are mismatched -- it's not a big deal.