"Actually test on a wide range of player options" is not, in fact, a wild ask, especially when we have examples of decent lighting in places (and honestly? even with a pale character, Ultima Thule is just really badly lit). A lot of these samples could just be solved by use of more indirect lighting, which is something they've already stated they're adding to the engine, so asking that all options are actually kept in mind during testing not only isn't unreasonable, it's the expected baseline of testing in a game with heavy character customization.