I took off today online into the sun and had also this sun flicker. It's very intense and beside the point that it is annoying, it's something serious and can cause an epilaptic seizure, even for people that never had it.
Many games have such a warning in their dislaimer.
The second point is, that with the reworked light effects, things in the shadow are too dark and when the sun is low, it's hard to see the ocean surface. Some more indirect lighting effects would help a lot IMO.
