But this was not for ordinary people (peasants) or even accountants, where practicality matters.
> Your brain is not powerful enough to pattern-match, but your incapacity is not universal
With some training it's possible to read Arabic texts. But this requires more mental load and practice compared to other alphabetical systems.
> Literal billions in the world disagree
Argumentum ad populum. There also billions of people using even worse writing systems - non-alphabetical ones. This doesn't mean that they are as good as alphabetical systems like latin.
The video you linked has nothing to do with practicality. It's about calligraphy, which is an art form. It may look good, but it doesn't matter for daily use when one needs to read and type a lot.