Comment by groundzeros2015

> I could find in there was that the author does not like the people using/doing research in geometric algebra

The start of the article makes a specific technical claims:

> Hestenes’ Geometric Product is not a very good operation and we should not be rewriting all of geometry in terms of it

Later he explains why:

> there is no good general interpretation or usage for the geometric product or mixed-grade multivectors