By "Eye of Sauron," I meant that it affects every fifth enemy, and the fact that it doesn't activate immediately is true.
It's possible to play without the Dimension Door spell, of course, but in the end, the rating at the end will drop to an extremely low level because it will take too long. And having an awesome army, spending weeks chasing after minor heroes, just isn't fun.
The Eye of Sauron really slows things down. In fact, without it, the game would be too easy, given the diplomacy and the subsequent investment in powerful units like trolls. But with it, you also need to accumulate enough money to recruit units.
Regarding the atmosphere. For me, only the original version of the game works consistently without the Russian localization. The localized versions crash very often, so instead of text, I just see dots. And I'm used to playing quickly, without reading the text.
As for witches, I haven't used them in a long time because they make the game too easy; they are imbalanced units, worse than cheats.
The last and most important question is how relevant it is to weaken bosses before the final battle. I don't really agree with that. I always want to defeat them all at once, but in this case, to defeat them, you either need to level up the hero to attack and defense values above 40 (so that even a thousand dragons can be defeated by a hundred titans), which is impossible due to the small number of ultimate artifacts and upgrade locations, or wait until you have a large army and enough gold, and then use the town portal to gather them and fight. But this will result in fewer points after the victory. And the main goal of the game is to complete the map in the fewest number of turns. And, of course, it doesn't take much intelligence to gather troops and strike, so that all the enemies are destroyed.
Weakening them requires some skill.