Thanks for doing that research and sharing the answer, Plokite_Wolf. At least the devs gave an answer instead of ignoring the question. I am sympathetic to their reasons.
On the other hand, a GOG user's purchase money has the same value as a Steam user's, so it sucks really bad that the GOG version is stuck being sub-par. I interpret the statement "If we end up in a situation where we have available resources to make a GoG version, we'll look into that too" to be a very polite & considerate indication that it ain't ever going to happen in reality.