https://www.apple.com/macbook-neo/
Try to skim this page to get a sense of how much information is on the page. You can't. 90% of the scroll time is stuck in useless animations.
Every time you scroll down you have to wait for the page to render. We've somehow recreated the dialup experience with single page apps.
Your brain is trained on how scrolling works on 95% of pages. Breaking that patterns causes tons of cognitive overhead. You now have to do a double-take every scroll action when you just want to absorb the contents of the page.