Electricity prohibition on Shabbat

Greetings to the Honorable Rabbi,
I was in a class that the Rabbi gave in Shoham,
Afterwards, I approached the rabbi with a question about the essential difference between operating a device by an electrical mechanism
and its operation by a mechanical spring mechanism.
Since, as I understand it, the Rabbi placed the prohibition of construction on the fact that the mere act of operation changes something fundamental in the device, which becomes
A device in operation, the answer to my question is critical since, seemingly, even when operating a switch in a completely mechanical mechanism
We will go over exactly the same craft.
The rabbi did not answer me, after which I pondered the matter further and wondered if there was no mistake here.
Essentially, an attempt to find a halakhic prohibition from among the Sabbath prohibitions using complete technology.
I will explain my argument:
In the prohibitions of Shabbat, it appears that the Sages prohibited crafts and not technologies.
For example, cutting with a knife is not prohibited.
If I cut oats with the knife, I will violate the prohibition of reaping, and if I cut challah with the knife, it will be part of the Sabbath observance.
Another example, riding a horse, the Sages forbade because ‘it might tear’ and not actually the rider’s body.
It is true that it is not actually possible to use cycling technology on Shabbat, but the very prohibition stems from doing a craft while using this technology.
The approach to the electricity ban was supposed to be like this.
From this perspective, there should not have been any prohibition on connecting an electrical circuit on Shabbat. If it is a circuit that does nothing, there is no prohibition on electricity.
Our problem is with things that are done with electricity, and here every question is irrelevant.
Is lighting a light a craft?
Is operating a device like a fan a craft?
Is opening a door on Shabbat a chore?
In such a perspective, we touch on the things themselves, the very things that the rabbis were so concerned about that would harm the character of Shabbat.
There is no harm in the character of Shabbat if I open a door even if the mechanism is electric.
And there is a violation of the character of Shabbat if we allow crafts that would allow people to continue their normal work and occupations on Shabbat.
I’m afraid of the moment someone dares to allow phone/computer/internet use on Shabbat.
Even if the devices are operated with sound waves without electricity at all (as I said, technology is not the significant factor)
I would love to hear the Rabbi’s opinion on this approach.
thanks,
Dalit