Thermometer is objectively the best tool in the kitchen when cooking any steak.
You method is fail because it doens't take into account
1) Differences in steak thickness
2) How hot a stove gets
3) What cooking utensil someone is using
4) Starting temperature of the steak
5) What doneness a person may or may not want it.
When you can eyeball all that with almost 99% accuracy, then come back.
you fail, i will address each of your concerns in order, and you will no longer refute my method for cooking ribeye.
1) it doesnt matter
2) any stove will get hot enough to sear a steak, if it doesnt, then your stove is broken.
3) the hell does that have to do with anything, flip the stick with a fork, a spatula, a tongs, or a spoon for all i care. hell flip it like a pancake.
4) starting temperature doesnt matter all youre doing is searing the outside.
5) the only acceptable doneness for ribeye is rare. if they dont like it they might as well throw the ribeye in the trash, or they have bought a mislabeled steak.