It's really hard for me to not make some incredibly dismissive "okay, boomer" comment here, but you are not giving me much to work with and this really reads as obstinate resistance to learning new things. Are containers different? Without a doubt. The benefits are, however, impossible to ignore.
The amount of work you are complaining about is, objectively, trivial. It's no harder than learning how to deploy on another distro or operating system, except in this case, your new knowledge is OS-agnostic.
I agree. All he is doing is making people uncomfortable for using containers. The only real major downside with containers is that the building process is quite expensive so you should get familiar with docker run -it --rm <id> bash or the same thing with docker exec. Oh and also that your container might not come with diagnostic tools.
The amount of work you are complaining about is, objectively, trivial. It's no harder than learning how to deploy on another distro or operating system, except in this case, your new knowledge is OS-agnostic.