This is to avoid talking about the teleporters in the 4th installment. All the ancient colonies were connected by such gates.

So, they stood before the Gates. What happened to Castor and his team was unknown to the Lords, but Respektor's team was present in full. Inserting the missing part into the Gate, the heroes teleported to a hub station, where they were greeted by Korak. He told the heroes the whole story about the Krig invasion and their destruction of the Network of Hub Stations, and also told Respektor, Kreg Hak, Seru Kanegem, and Robert the Wise about the fate of Sheltem and Korak-B. Korak also said that it is impossible to reach the Ancients from his station, but he saw the heroes as a force that would help other colonies that had fallen into decline after the collapse of the Network. And so, a myriad of other worlds opened up before the heroes.

Also, let's not forget that we are not just talking about Heroes of Might and Magic, but also about Might and Magic. As NecroFill rightly pointed out, now there will be a lot of problems with the connection between these two games.
The fact that another company is working on the continuation of the game does not mean that this company can change what was created before it. They took on the task of making a continuation of the Might and Magic series, so let them do it.
The transition of the 4th part has already taken place before. When the action moved from Terra to Xeen. I don't hear any outrage about that.
Dion will immediately change his attitude towards the heroes if his favorite mages are removed from them. And try to convince him that the world is different and that the Academics have no place there. Only Voodoo shamans can live there.

In general, I think that Heroes 5 should acquire its own independent and unique look, and if Nival implements all its ideas, then huge respect to them!!!

1. No one is against this. It is only said that the rules were established before Nival, and they are obliged to follow them.
2. Nival has not yet implemented all its ideas. It announced a lot of new features and abandoned them all. Only ATV remained (and that's not a good thing).
3. "independent" from whom? The world must be connected to Dark Messiah in any case. The fact that the events of DM take place on the Border Islands (I hope I wrote it correctly, if not, I apologize) does not explain the absence of orcs in Heroes. Orcs have demon blood. Explain to me, defenders of Nival, how orcs could stay away from such events as the largest demon invasion. They are brothers in blood with them.
4. "a unique look." It would be good to explain this. Unique compared to what? To parts 1, 2, 3, 4? Yes, this is the case. The interface is completely different. Excuse me, but when you sit down to play a sequel, you expect to see a slightly modernized old, good interface. As it was before. Call it a plus? I don't. And it doesn't matter that it is more convenient for someone. It's just not from these games:(