usability - Length of Page Concerns

This is a reoccurring problem among clients I work with, so wanted to see if anyone else had some insight. Every client I design for tends to be hyper-aware of page length, with the tendency to fret over if the user will get "lost at the bottom of the page" or need help navigating back up. The pages are of average length, and I try to assure them that users will just scroll back up if they need to. I provide multiple CTAs along the page, including top and bottom. But still, the clients want to include "back to top" elements or fixed top navs. Does anyone have ways they combat this? Any data or articles?

Thanks!