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It's impossible to play Giant Scenario maps of "incredible" and "incredible with Dungeon" sizes without it. You probably haven't played such maps if you think that way.
Well, Astral is really necessary on large Giant Scenario maps. In theory, you can break through any guard with Dark Magic (Necromancer or with artifacts that ignore magic immunity), but as a rule, maps of this size are not played to clear the entire map, but after a certain time, you simply teleport to meet the opponent.
Yes, I haven't read the whole thread, and I haven't played Heroes for a long time, but I had to jump in and express my very important opinion.
For me, the whole point of "Heroes" was playing on Giant Scenario maps of "incredible" and "incredible with Dungeon" sizes.
Будьте осторожны со своими желаниями. Иногда они исполняются.