Watched two episodes of this on Netflix, so I'm not sure which season they were from. I haven't seen it before on regular TV, but I gather it's been on A&E? At any rate, the first episode featured a soon-to-be-married couple who were building the tiny house in Georgia and then moving it to Maine, and the second featured a 25-year-old daughter whose estranged dad was building the tiny house for her.
I felt like the first episode spent WAY too much time on the "problem" of their hobbies (him - playing the banjo, her - sewing). They never even showed where these people were going to keep their clothes. Also, while natural light is important, the entire front of the house was a gigantic bay window, which didn't seem like a good use of limited space. I also didn't get why a tiny house was a good solution for these two. Real estate in Maine is not that expensive, and he already has a job lined up there. If they saved their money, instead of sinking it into this tiny house, they easily could save a down payment on a mortgage, especially for small town Maine.
My issue in the second episode wasn't so much with the house but with the woman the house was intended for. She's 25, living in Zionsville, Indiana, and can't move out of her mom's house, except to move into a tiny house in the backyard? She lives right near Indianapolis, and has a college degree (a folder from Indiana U was in the background): why can't she get a job and a small apartment? It's not expensive! Or share one with a roommate (e.g., one of these friends she wants to have so many "dinner parties" with, or with her twin sister). The dog she has is small, so finding a pet-friendly apartment shouldn't be a problem. If she had been living in the Bay Area or other similarly expensive place, I'd have had more sympathy, but in Indiana? No way! Get a job and a real place to live.