The idea is that your life may depend on little things like a better tourniquet in your medkit, or better scissors or sanitizer, or even stupid tissues.

if we create a hypothetical arterial bleed on the leg, after a while our subject loses consciousness and lies on the ground, do you really think you are able to lift his immobile limbs several times and in the process maybe make an open fracture while tightening the rubber tourniquet with both hands

Bad substitutes
It is indeed advisable not to improvise and use substitutes when saving lives by stopping arterial bleeding. For example, the old rubber tourniquets are already obsolete. They will "perfectly" strangle the limb and may save the life of the injured person, but the leg or arm will have to be (unnecessarily) amputated. This applies to the various strings, ropes and shoelaces which, for example, are lying around during car accidents and which you would like to use in good faith. In these situations, really think twice.

In any case, do not use paracord as a tourniquet, even though various articles on the Internet endorse and even recommend the use of paracord to strangle arterial bleeding. The thinner the tourniquet, the more painful it is for the injured person and the more likely it is to lead to further secondary injuries.

Suitable substitutes
We have already discussed inappropriate substitutes for tourniquets, but there are suitable substitutes that can be used in a real emergency without doing anything wrong. Use any piece of cloth that is wider than 50 mm and ideally stretchable/extensible to retract the limb. This can be, for example, various scarves, trousers, leggings, T-shirts, jackets... then use a stick, a writing pen or a stick - in short, any suitable thing of an elongated shape that you can get your hands on at the time.
Source of this:
https://www.rigad.cz/magazin/vse-sk.....idla-turnikety

If you have it, don't be afraid of using it.
There are certain myths about the use of the tourniquet, for example that after the application of the tourniquet, it will be necessary to amputate the limb because of poisoned blood, logically this is a lie, not because I mention it, but because sources say that the limb can be choked for up to two hours.

A word to the end:
A rhetorical question is a question that does not require an answer and to which an answer is not usually expected. It is not really a question, but an exclamation.
I'm not a paramedic or first-aid graduate, I'm just a guy who's been thinking.
I don't know what to title the post, if you can think of something better, more accurate definitely tell me