The context is that it's somebody else setting up what's basically a dumb phone for family members. I agree that custom roms are a terrible idea for non-tech savvy folks if they have to set it up themselves, but in this specific narrow case it's a good solution.
That's correct. I wouldn't recommend a custom ROM to an average smartphone user, but when you have someone in your life that's dedicated to tech support and you have custom needs, it's a good idea IMHO.
I consider helping my family with their tech stuff a privilege, not a burden. They help me with so much, why wouldn't I want to guide and support them on things I am knowledgeable about?!