What is slant?
Also, I made an account and voted. Most of the "cons" that were listed were like... completely wrong.
And "poor interoperability with C++ (and you need to write tons of C++ wrappers)" is kind of insane. Allegro is almost entirely a singleton. How many wrappers do you really need? One for a resource manager, and... AND? And the fact that DAllegro exists and works great (when D is a higher level than C++, OOP language) seems to me a completely disproven argument without specific examples.
I'm hoping to do some gamedev and YouTube videos in the nearish future (hoping my health improves) and I'll definitely be citing Allegro as my go-to.