Annah sorry but your advice is somewhat adrift I'm afraid. Follicles can be killed first time if it is done correctly. The insertion has to be bang on and the energy needs to be adequate, it also needs to be released in the correct place/places within the follicle. Depending on modality this is done differently.
For a blend treatment the needle is inserted and kept still (sometimes) whilst the energy is released (anywhere between 2 and 7 seconds. This allows for the lye to build up and spread within the follicle causing the relevant cells to be killed. Similar for galvanic but without the addition of low level thermolysis to warm the lye making it more effective.
For flash there can be a couple of pulses, sometimes more. The pulses will be released at different depths within the follicle to ensure the right areas are hit. With flash depending on machine and operator each pulse will be very quick (fractions of a second rather than seconds) For chin hairs a good amount of energy can be required to achieve a successful 1st time kill. Chin hairs are amongst the strongest ones you will come across, some of them are so big they have personalities. Usually at least 2 pulses are required unless the hairs/follicles are very shallow and this would be unusual for chin hairs unless they are in telogen (late stage, almost ready to shed)
Each follicle goes through three stages: anagen catagen and telogen You're going to hear that hairs can only be killed in anagen but it really does depend on who you speak to, the majority do think this, I don't.
Hippolover your electrologist is gently tugging on the hair to make sure it is fully treated. If she is working properly the second she encounters any resistance she will stop gently tugging and re-insert and re-treat the follicle. A hair will slide out without resistance when it has been adequately treated. it shouldn't feel like the hairs are being tweezed. You might feel the odd tweezed hair sometimes. This can be an adjacent hair that gets tweezed accidentally or it might be one that is particularly stubborn and your electrologist may be reluctant to use more energy or to treat it again. With someone who knows their stuff tweezing really shouldn't be happening very much.
The myth that follicles can't be killed first time is a convenient one because it is an excuse for under treatment or for an operator who has poor insertion technique and isn't putting the energy in the right places.