Walkthroughs for custom maps.

I wouldn't have written this whole wall of text if you had just said, "I play the original SoD because I'm a fan of the archaic," but you said it as if you were stating a truth, implying: "I play the original SoD without the HD mod and SoD_SP, making my game 10 times more inconvenient, and I think everyone else should do the same." That's why I wrote this post; I think it should be obvious to anyone who reads it that you're wrong.

Maybe you shouldn't attribute your own words to your opponents and play mind reader.
In none of my posts did I urge anyone to play "10 times more inconveniently" or claim that everyone else should do the same. My opinion is just my opinion; if someone disagrees with it, I'm not forcing it on anyone.
You, young man, asked me to explain my motives, and I tried to do so. That's all.

Added 5 minutes ago

Obi, I have a feeling that it's practically impossible to convince a person who stubbornly plays Heroes without the HD mod on any issue (gaming or life).

As if a person playing with HD, and practically any person, can be convinced of anything.
People are very stubborn creatures.

Added 12 hours 29 minutes ago

Why you focus specifically on the developers of SoD, which was released in its "bare" form 20 years ago, is unclear. Okay, if you found out that baratorch, who is developing the HD mod, or RoseKavalier, who is developing SoD_SP, suddenly turned out to be the developers of the game, would that make you feel better? Or if the developers, who haven't worked at NWC for a long time, looked at the HD mod and Sod_SP and said, "Cool, it's a shame we didn't think of this 20 years ago," would you then start using these tools?

Let's consider an analogy with a bicycle. Why do people ride mechanical devices in their "bare" form, which were invented 200 years ago? After all, there are more convenient devices. Would it occur to you to ask a cyclist a question like, "Why are you attached to this outdated mechanism, because its developers simply didn't have enough time/money/technology and knowledge to come up with something more perfect? Switch to a Segway – you don't have to pedal there"?

Added 31 minutes ago
I'll add that some of the features of HD, such as the instant buyout of the desired hero, are hard to call anything but cheating. Many will disagree, saying that buying out a hero is just a matter of time. So, why bother, for example, with generating convenient starting saves or the morale of 3 stacks in a row dropping, without which the battle cannot be won – because the desired event will happen sooner or later anyway, so let's just draw the desired layout in some plugin.