When I bought the original Mac Mini, it had DVI output at a time most people still had VGA monitors. A DVI-to-VGA adapter was provided in the box. More recent

When I bought the original Mac Mini, it had DVI output at a time most people still had VGA monitors. A DVI-to-VGA adapter was provided in the box. More recently, a new Sapphire GPU came with DVI and DisplayPort outputs. An HDMI adapter was provided in the box. There's nothing wrong with USB-C. But right now most of us do not have anything compatible with it. My monitors and TV are all DVI/HDMI/DisplayPort. Every peripheral is USB-A. Adaptors for the common cases supported by their previous year's products (USB-A, HDMI, Ethernet) could have been provided by default to make for a much easier time. It's not like they didn't have precedent for making this just work for their customers in the past.