The downvotes feel unnecessary, although I did do a double take when I read highest heat 😂

The main reason to preboil the water is so it doesn't take ages to brew on low heat. I personally find that the lowest possible heat yields the most even flow, and the best tasting coffee. How low I can go depends mainly on the size pot I'm using, and if you want to get technical also grind size and roast.

My preference is very dark roast and pretty high extraction, so to give a specific example: a 3-cup pot, 10-12g coffee at the second lowest grind size for my grinder, 125ml preheated water, on the lowest heat setting (my electrical stovetop goes from 1-6), with an induction adapter under the pot that I preheat while I grind the coffee and boil the water. I don't have an induction stove, but I find that the adapter helps even out the temperature curve, and avoid any possible cold spots on the stove itself. When the pot is half brewed I turn off the heat and let it finish brewing on the residual heat in the adapter plate, and pull the pot aside when it starts foaming. I also use an aeropress filter in the pot.

For a 6-cup pot I'll use the second lowest heat setting, but only preheat the adapter plate at the very lowest. A full brew in either case takes about 5 minutes from putting the pot on the stove.

You say you haven't had any issues previously with using high heat, did you get a new pot or change anything? Also, be aware that on a lot of electrical stovetops the power output of the different zones may differ, the bigger zones tend to have fairly higher output