I’d like to see you hand draw full feature length films without ever recycling frames.
Pretty sure these were intentional throwbacks and homages. You don’t recreate entire scenes and not expect someone to notice.
This was done entirely to save money. In the 70s, Disney was not doing well financially and was cutting corners, mostly in the animation department. (Most of the execs thought the company’s future was in live action films.)
This was also before the concept of home video was in most peoples’ minds. The only time people got to see these movies was during a theatrical run. No one noticed the recycling until the 90s once everyone had them on VHS.
Hell, they even recycled some animation for Beauty and the Beast. It wasn’t until about 1990 that the animation budgets were high enough to allow them to do entirely new animation for every film.