You're actually making sense now. Good job. I mean that.
Simunition training can be extremely useful, but it is true extra precautions must be taken. But for clarity, it's not really all that easy to load the wrong ammo. Simunition guns all fire a near-9mm round. This round won't fire in a real gun, and you can't load a real round in a gun that's been modified for simmunition. For handguns, you swap the barrel. So with reasonable caution, extra safety checks, and shooters who are not totally new, simunition can be used with reasonable safety.
The company only recently began selling to civilians, and it's still quite restricted, so that can also be a factor in choosing what to use for simulated firearms training.
There are a few diffrent types of simulation round, UTM is one. I think the companies use diffrent conversion kits, there is maybe one semi unsafe one that will at least fire a real round, but the ending result would be something along the lines of it just exploding inside the firearm.
the issues only in the conversion kits, due to barrels being extra cost, maagzines being extra cost etc. So it just depend show much and what is changed. If its built ground up, it should be made not to accept live rounds. (which i belive simunitions and UTM make training firearms AND conversion kits, or last i looked they did)
Depends on the simulator. Playing Call of Duty is not going to do anything useful. Just like watching YouTube isn't an effective way to learn to fight. Paintball markers lack recoil, and of course aimpoints and such are enormously different, but they can be used to train things like movement and covering fire.
It's important to note that those groups use these tools as SUPPLEMENTS to training with real weapons and ammo. Just as books and videos can well be used to supplement an instructors training.
Its more about attitude, everything has pros and cons and limitations.
Airsoft is more popular for training than paintball due to the fact airsoft has more and is easier to make replica and honest replicas of firearms as opposed to paintball.(manual of arms) The paint ball "replicas" are meh. Honour system is null if used for training.
Hell if you analyse simunitions, paintball, MILES and airsoft, youd find the limitations are similar. Airsoft, sim, and paint ball have the same range, the same sort fo thing is cover for them thats not for actual bullets. and MILES is a laser.
to be fair for airsoft youd get just the HEMA and LARP argument just shootingified, as the logic in airsoft of avoiding getting shot while shooting people is pretty much what you do in tactical shooting. (with the sport caviate applied)
The last point is where i think we get confused. When i say "learn from a book" i dont mean just read it (i dont think anyone does), i mean learn from it. That is if its about punching, you read it once, get up and follow it step by step and practise punching the air or on a target. Its only a issue if you get stuck, then you could ask in a forum like this, or try and find videos on mistakes.
They key is just the book needs to be made for it and for your level. There is only so much a instructor, book, video etc can do for you, its still fundmenetally on you to understand and apply the information, you interprite the information and apply it to yourself.
Just apply this sort of process: Some people go off and hunt to learn to shoot, some get taught by their family/freind and some hire somone to teach them. None of these are abolutely the best, all have pros and cons, and work for diffrent people. and in some cases you dont have a choice.
Lets be compeltely fair, whats the diffrence between a 7th degre black belt holding pads, to your freind? Or whats the diffrence in punching a heavy bag at a dojo, or your house? Basically youd pay somone to go "yeah like this" when you get stuck, if you can learn it from a book, then no need to pay somone, not everyone can learn it from a book. People have made study groups to basically figure out fighting with some people who are intrested in doing the same where no other school or teacher exist as well. All martial arts came from scratch, we have some innate fighting ability programmed into us.
Granted this is all heavily reliant on the skill, not all skills are the same and not all people learn all sort of sub groups of skill the same, or even learn the same. I prefer reading backed up by pictures and videos, and doing.
And there are also so many caviates and what ifs in education to begin with, and many things are subject to argument.