A wok has 2 important features: it has a round bottom and it’s thin. The thin sheet steel allows it to heat up and cool down quickly. Maybe you can make a thick-bottomed pan that has a rounded bottom on the inside. And maybe you can pump enough energy in it to make it heat up quickly, but you can’t suck the energy back out. If it’s that massive it will not cool down quickly.
This is pretty much the case for all good induction kitchen-ware, since this is one of the main ways of cooking that induction allows that no other kitchen powersupply has.
A wok with a flat bottom outside and curved surface inside would also be heavy.
Yeah, it is heavy. You cant really toss things in it like you would a carbon steel wok.
If it’s heavy cast iron, it’s not a wok but a wadjan. Does it have 2 handles as well ? A wadjan is an Indonesian wok-like pan, but unlike a wok a wadjan retains heat due to it being heavy cast iron. A wok should be thin sheet steel so it heats up and cools down very quickly.
Wadjans are very good for things that have to stew/simmer, which is common in Indonesian cuisine. It has different uses than a Chinese wok.
Here is a link that might be more useful
https://i.imgur.com/NKXQpXZ.jpeg
https://i.imgur.com/4MlLayk.jpeg
Yeah, it isnt quite like a carbon steel wok but most people in North America wont have a a wok burner to hold the round bottom so they need the flat part.
You also definitely cant cook in them quite like a wok since as you say the cast iron holds so much heat. I usually just get it real hot on the burner for 5 or 6 minutes and then stir fry something. You have to take the food out when it is ready though because moving so much iron off the burner doesn't cool it down as quick.
It has a flat bottom "outside", inside it has the same shape as a normal wok.