You are conflating two very different things.
Turning in papers via email is no more of a deal than posting on CC, and if there is a college or university that doesn’t use email, online registration and other systems to manage the admin side of things I will be very surprised.
But that is not the same thing as interacting with a professor and learning through engagement in classroom discussion. UMi is a huge university: try looking at LACs (liberal arts colleges) which are typically smaller, more individual and definitionally focused on undergrad teaching.
Not finding a large uni a good fit is perfectly normal and reasonable; expecting a technology-free university is unrealistic. I would argue that it is also undesirable. Here’s an example, from one of my collegekids: she took a course last semester in 18th century journalism. Much of her research for her final paper was done in the college’s archives, using original 18th century newspapers, which she found very cool. But as the research progressed she realized that she needed some additional materials to develop her thesis. She worked with the college archivist and together they found what she was looking for - online. The additional material was archived in two different countries, yet fully available to her. A small example, obviously, but I would argue that you will be “losing out on a dimension of instruction” by closing off the resources available to you online.
Of course, that is your prerogative!
You might look at Hampshire College, Berea College, any of the Colleges That Change Lives, Evergreen State, St Johns College (strong Great Books program), Marlboro College, Bennington, College of the Atlantic