Why can't Guma pick Ezreal more often?

Ezreal is a really strong champ that can be both be played as a weakside AD or lane abuser with Karma, has probably the strongest 2-item spike in the game with good scaling. Ofc his Ezreal is not on par with names like Ruler, Viper, Teddy or Deft. But these players all have Ezreal as their most-played with more than a hundred games on-stage while Guma only has 25 games so far. So naturally he'd be way less comfortable, right?

His performance against T1 was actually pretty solid considering the "lack of experience". Isn't the only way to get better at a champ is to pick it more often? Win or lose, playing on-stage definitely helps loosen the nerves over time.