Anon. You're overthinking this.
Jazza is shit. Obscenely shit and cannot even animate as good as he adverts. He is literally only popular because he had a smart approach making tutorials for the everyjoe who draws stickmen, heavily branded himself very early on when there weren't alot of youtube tutorials around yet. If he started in 2017 no one would be talking about Jazza.
The anons just made a joke because you're using the same /beg/ tier methods someone completely new to digital drawing does. This is exactly why Jazza is shit, he's a /beg/ teaching other /beg/s.
He doesnt "use vectors". He draws in Flash/Animate, as he always did. Flash uses Vectors by default. Its not some professional choice. Most animes are made by paper and scanned or drawn in RETAS/CSP, which is raster based. Has nothing to do with techniques.
Jazza is the definition of someone who thinks using tons of equipment makes him a pro. I doubt he can do the "child with a hammer" trial without obscene use of tweening. He cant freehand shit that you wont finf by 16 year olds on dA. All those Cintiqs and gloves wont make him decent.
If you wanna get better, the sticky has all you need, friend.