Animation the old fashioned way was so labour intensive, it needed vast teams of artists working all through the night. Some were talented, most were doing repetitive
jobs, copying and colouring, tedious time consuming work.
Old school animation's greatest masterpiece, just my opinion, was Tom And Jerry, The Night Before Christmas 1941
MGM had lots of money at the time and they could afford to spend whatever it took to create this sumptious visual quality. It was a wise investment as these old toons are still making a profit from them over eighty years later. Since the humour is all visual, they have been popular on TV all around the world no matter the language.
Full versions of TNBC keep getting deleted from YT for $$$ reasons, so instead use the link to the Archive;
*HBO Max print Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for fair use for purposes such as criticism, comment,...
archive.org