Hey there and thanks for reaching out!
Solid question. We do indeed provide support for the exact things you mention, regardless of what theme you use.
What we cannot support is when there are conflicts with themes. We will often try to check it out with you, but it’s often better for the theme author to review the conflict, particularly when that issue is not present in a default WordPress theme, such as Twenty Sixteen.
Does this help clarify things a bit? Please let me know. 🙂
Geoff