Heading towards CIS-2020.

What is the purpose of this rule? To test who is better at calculating guards/memory for viewing/calculating damage manually (will Redwait calculate the damage in the final version using the physics formula on paper without a program)?

The goal is simple: to play the game independently using only the game's own tools during a "live tournament."
Otherwise, how do you determine the line between what is allowed and what is not? Tomorrow, someone will write an auto-route planner for the optimal path. The day after tomorrow, a neural network will learn to conduct the most diverse battles optimally (someone has already started experimenting with this). Then they will invent something else about building chains effectively.
And then someone will come to the tournament, and a machine will do everything for them. The question is: what is the point of the player then?
Default rules are needed only and exclusively for those who cannot reach a common understanding. If there is harmony and understanding in a progressive HotA community, then what is the problem? You agree with each opponent: "Hey, there's some confusion in the rules, let's watch videos, take screenshots of the cheapest spell in the game, enter everything into a program that will give an answer about the range of the Pandora's Box, and each of us can use our own secret program." And if the opponent agrees, then play whatever you want, no one will interfere.