I fully get that modern dishsoap isn’t caustic enough to truly strip the seasoning, but I have noticed it does very slightly affect the seasoning.
For 99.9% of the time it’s not necessary to use dishsoap and if something is really burnt on, then I’ll tend to go with something a bit more abrasive like a green scrubby pad or maybe steel wool or a paste of baking soda and water.
It’s the same thing I do for my carbon steel wok too, boil water, rinse well, dry with heat and reapply oil to the reheated surface.
People make this shole “cast iron cult” thing out to be a much bigger thing than it actually is. Cast iron is a durable material and has been used as a tool for cooking in the harshest of conditions for centuries, but to be able to use it in those harsh conditions it needs to be properly taken care of just like any tool.
The reason people seem so neurotic over taking care of cast iron is that cast iron cookware is an investment. Year after year a cast iron pan (and this applies to carbon steel pans too) becomes better and better the more the thin layers of oil polymerization into the seasoning. A fresh off the line Lodge dutch oven doesn’t have the years of layer after layer after layer of polymerized oil on it as the same mode Lodge dutch oven my grandmother used when back she was half my age.
Cast iron is easy to take care of, there’s nothing special about how to take care of it, but the ways to take care of it are specific because of the nature of the metal used. Hell I spend less time cleaning my cast iron pans and carbon steel wok than I do cleaning any other pan type.