The thing is, while I agree we could just make decent and frugal websites, gemini not being based on html is a feature. It allows us separate both worlds.

When I open lagrange (a gemini client) and click on a gemini link from any gemini capsule (site), I am confident it will open something similar.

If I am opening a website, even a good frugal one made in HTML without js and click on an https link, I can't be sure if that won't send me to a page full of ads, tracking and heavy javascript with an embedded crypto miner.

You often find some http/https links on gemini capsules, but most clients will render the link in a different color so you kbow what to expect when clicking on a web link.

You can prevent many kind of ads and tracking from working and disable JavaScripts (and other features if wanted, e.g. CSS) entirely, although there is no guarantee that it will work.