some people even mentioned they regularly entertain 20-ish people in their house
We've done that exactly once, probably just under 20 people, and I was a wreck for two weeks ahead and a week after, and was an absolute crap host, because I was so worried about everything, and I also spent a good bit of time rather angry at a lot of the guests!
I got Laura Calder's book "The Inviting Life," because I wanted to try and crack the code on some level of entertaining, because MrsT would like to have people over occasionally (but not 20!), and if Ms. Calder is to be taken at her word (and I think she is), she pretty much exists to throw dinner parties, and 20 people is nothing.
I read her book, and read it again, and as much as I like her old TV show, I just couldn't help but feel that, if I knew her in person, I wouldn't like her at all, and I'd probably take some small pleasure in stealing her mail and letting the air out of her tires, just to mess up her day a little.
especially if the company is going to offer unsolicited cooking advice
That's a huge peeve of mine. MrsT likes to post some of our food on FB (I'm not on FB), and she has one friend who constantly comments in the form of, "That looks great, but..." and then offers some "constructive" criticism.
Two problems I have with that:
1. This person is a self-appointed expert it every cuisine under the sun, and will lecture a native cook on what they're doing wrong with their own culture's cuisine ("Well, I know you're Algerian, but my mom's best friend in high school, she lived next door to a family who were friends with another family, and their cousin's car mechanic was Algerian, so I do think I know a little bit about that dish you're trying to make..."
2. She...wait for it...doesn't cook! All of her "helpful advice" is based on how "my mom/grandma/neighbor/that restaurant I went to once/that TV cooking show I saw" does it!
By the way let me just add how much I'm enjoying this conversation
Same here! I'm actually somewhat preoccupied/fascinated with other people's kitchens, especially when they're from another country/culture. MrsT always laughs at me, because I watch a lot of foreign films/TV shows, and if there's a scene shot in a kitchen, I'll back it up and watch it over and over again, looking at the light switches, and the appliances, the way things are stored, etc.