My retina is curved. My eyeballs do not contain multiple elements. IF flat sensors were "simpler" to design for, I am quite disappointed that we have not evolved that superior level yet!
The eye has only very good center sharpness. But to the periphery sharpness/resolution declines and the colour sensitivity too; but the peripheral sensors are faster (some flourescent tubes flicker in the periphery but are stable in the center).
On the other hand you need a very wide field of view (roughly 180 degree horzontally) to be aware of potential threats. The "eye-brain" directs the sweet spot of our eye to the potential threat.
Our "eye-brain" scans the scenery and stores details - we think that our eyes are optically very good but in fact they are not compared to good primes e.g.
So photography has to store a lot more of detail than we might read in a glance.
Where our eye excells is the dynamic range which might be 20 stops which is
FROM full sunlight (1000 Watts per square meter)
TO micro LED torch illuminating a medium large room (0.001 Watts per square meter)
through (1) using an auto aperture, (2) high DR sensors and (3) relying on two types of sensors activated for its special purposes.