others are using "personal" to mean "regarding the individual person themselves"
Following your logic, we cannot critique anyone in particular ever. How absurd!
You're using "professional" to mean "regarding the profession" whereas others are using to mean... you know, the opposite of "unprofessional".
At the end of the day, it is the same thing. Person does what is their job according to common standards.
Andrew runs a software foundation, and it is his job to make sure that behavior of one of related projects does not disrupt the stream of all donations or bury his project under a pile of slop submissions. Highlighting the technical dysfunctions of the other project is an effective way to show the differences between the two. Do you have a suggestion that would be just as effective, while being more "professional"?