There are lots of perfectly good (well, suited to their purpose, anyway) appliances (as in: pieces of hardware that cost money) out there that have web interfac

There are lots of perfectly good (well, suited to their purpose, anyway) appliances (as in: pieces of hardware that cost money) out there that have web interfaces that don't speak 100% valid https. In part, this is because achieving fully-valid https on a machine on a local network, without a static domain name, with a machine & network config that you (the vendor) don't fully control, potentially without an Internet connection, and without installing root certs on client devices is, to put it mildly, inconvenient, and used to be even worse. Getting rid of http or insecure-https support completely would render either them, or your browser, useless, and require that one or the other be replaced.