Update for Baldur's Gate 3

With Patch 8 they added PlayFab support which in turn brings TURN relay support for cross-platform play. This can also be used to bridge GOG-to-GOG and GOG-to-Steam players that use CGNAT/DS Lite.
The only disadvantage is that it cannot be used anonymously and requires a Larian account to use.

Such functionality however is still missing in Divinity: Dragon Commander, Divinity: Original Sin 1 and Divinity: Original Sin 2 which all support Steam Datagram Relay and no non-Steam, cross-platform equivalent.

Alright, I just found out that Baldur's Gate 3 on GOG doesn't show Japanese as available language even though it was confirmed it's actually available. This comes after MarkoH01 confirmed that Succubus on GOG comes with Hungarian despite not being shown in the store page. This means we should keep in mind to verify missing languages whenever possible rather than just trusting the store page.

Mistake on my part, I corrected it

The link you gave is for Wizardry: Proving Grounds of the Mad Overlord, not BG3.

But yes, comparing both store pages, BG3 misses japanese localization on GOG at least in mention.

Yes, about that I've noticed that Chef: A Restaurant Tycoon Game is still on the list because of the lack of Spanish language but it's there (for a while now) even if it doesn't appear on the GOG game's page.

So I think the game is really complete.

(attached 2 images)

I'm more than certain that GOG has dozens, if not hundreds, of games with outdated or incorrect information in their game cards. Since only the GOG staff can update them directly, and not the developers or the publisher, the system is highly prone to errors.