Certification no matter for what system/platform/language only guarantees you have touched the subject. No certificate will replace talent and experience. Creation of games it is just not about programming or knowing how to use tools, person needs talent and creativity, no course in the world can provide that.
If I look someone’s profile at Artstation, see he posting the workflow he uses, if it is good and makes sence, I will ask him for an interview and probably will have a 15min talk (because Im polite and will offer some coffee too), and will be enough to decide if I will or not contract him.
I have encountered in several years people which made courses and know nothing, while met a good deal of people which learned by experience and know more. I used to work in the banking industry (12 years), and a person having CISCO certification would just mean for me I would expend less with that person.
Unreal user base almost trippled in 1.5 years (1.3million for 4.2million), the competition is getting bigger, and it is a must people start to go self-learning and focusing on areas they are more talented and then going after generalization to get an edge.