Why?
It sounds like think so because it’s it’s what you’ve become accustomed to without questioning.
It's less power than loading a one more line of markup in the browser. Do you throttle the size of webpages in the interest of power? That's as ridiculous a "downside" as having to type one more letter. https has both practical tooling advantages and security advantages. Specifically, if you're in a network (or country) that is known for tampering with network traffic, https is a well tested preventative measure.