"Newcomer-2014. Summer"

Here is the final score for LM vs. NP - 10-5.

There's also another option: during mutual streaming in the final stages of tournaments (including 2v2), upload all the recordings and edit the game move by move. The recordings might last, for example, 7 hours in total, and that's just from one player. But during editing, the moves of two players can be condensed into 4 hours. Additionally, you can speed up or cut out easy battles, shorten restarts if there are obvious reasons, and as a result, experienced players might be able to comment on such an edited recording, possibly even together with the players involved.
Spending 3 hours watching a game move by move versus spending 7+ hours, doing who knows what in between the players' moves – I think there's a difference.

What prevents this from happening? Coordinate with streamers, edit, speed up... It's better not to cut out restarts; beginners usually ask for an explanation of how to identify when a restart is necessary. Then, find an experienced player for commentary.

Let me give you an example from real life – don't throw stones:
The kids decided to play basketball and asked you to teach them. They already make shots, know the rules, and can basically play more or less well. You agreed. And now you have a choice: join one of the teams and explain things on the fly, while clearly not playing at full strength; or act as a coach, analyzing and explaining everything during the game between the two children's teams?

Our beginners are not children; their level is now significantly higher than that of beginners 5 years ago, thanks to streams and the many tips on the game that can be found online, including on our forum.
Here's a fairly telling moment. In one of the games, about 3 months after I joined Heroes, I was hitting a Grand Order on a small map with 125 units. Half the forum was in my ICQ, telling me that it was impossible, that I would lose. And now, it's rare for a beginner not to defeat a Grand Order in the second week.
Heroes is not basketball. Randomness plays a big role here. And often, even against a beginner, it can be difficult.
The tournament score of 10-5 is clear evidence of this.

For myself, I can say that I find it more interesting to play; I have a hard time watching most players' streams and don't last long.

If you think that your idea will interest our "veterans," then contact them in ICQ and find out their opinion. Waiting for someone to post in this thread about their willingness to "train beginners" is unlikely to be worthwhile.

In general, in my opinion, analyzing save games provides significantly more benefit for improving your level than endlessly watching not-so-high-quality games on streams every day.
Thinking about save games is much more useful – why did the "veteran" do things this way and not another, how did he manage to win a battle with such losses – how to achieve the same, why was this hero chosen, why was this skill taken.
Being fed something pre-chewed won't teach you how to cook well.