I actually think if you pay more close attention (e.g. by training in meditation) you will see that there are no really neutral experiences, but there is also some kind of pleasantness in just existing without suffering.

It is true that the picture can be mixed though and it's not obvious how to treat that: see here for example https://forum.effectivealtruism.org/posts/bvtAXefTDQgHxc9BR/just-look-at-the-thing-how-the-science-of-consciousness