"Subsistence farming" is not an accurate description of the European world before the industrial revolution. Farmers worked cash crops like wool, made plans years in advance, and there were substantial markets. See for example Christopher Dyer, "Making a Living in the Middle Ages" (2009) [1]:
> "In managing the earth, vegetation and animals, the first priority of medieval men and women was to produce food, but they also expected to receive the benefits of their work in the foreseeable future, so the practised (to use the modern term) 'sustainable' agriculture. They planned for the same land to yield crops regularly, and the appreciated that well-managed resources renewed themselves. They anticipated the changeability of the seasons and the harvests, and hoped that their farming methods would allow them to survive in a year of unusual weather, for example by planting a variety of crops. At no time or place within our period can they be described as 'subsistence farmers' [emphasis added], in the sense that they ate only food that they had grown, or that they produced solely for their own consumption needs. They always expected that their land would yield a surplus, whether for the benefit of the state, the church or their lords, or for exchange for goods and services which they could not obtain from their own land.
Now, I'm not going to pretend that the industrial revolution was obviously bad for most people, but to say it was obviously good is wrong too. It's a complex thing, and it's not clear whether people are happier or even healthier in an industrial economy than an agrarian one.
[1] https://books.google.com/books?id=82zXFn-EDisC