What’s the use for proficiency with a gaming set?

Compared to other skill/tool proficiencies, being proficient with a gaming set seems horribly underpowered. Especially since there’s even a subdivision into different games.

I expect such games to come up sometimes, to win a McGuffin or gain trust. But the adventure needs to be tailored to it, unless you run some kind of shameful Yu-Gi-Oh ripoff 😛

Is this just a horrible Character building choice, or are there hidden used I’m overlooking?