It has already been said, but it begs repeating.
A lot of the old animation we know of wasn't tv animation. It was shown in movie theaters and was a different kind of production than what you would have for television.
Television's demands just couldn't be met if you pretended actual animation. So corners had to be cut at every single step. Synchro-vox was revolutionary, since it allowed them to use stills for most of the program's runtime and re-use them in others.
Getting cartoons on tv was a struggle. Anime was born in a similar fashion, when Osamu Tezuka opened Tezuka Productions and pushed for their "limited animation" style that wasn't up to their standards frame-wise, but still managed to make for interesting television.
On the same page, Hayao Miyazaki's enmity with Tezuka was born out of this because it allowed anyone to make "animation", because it was shitty and cheap. Thus "anime was a mistake".