What to give the Artificer at 7th level? It’s a bit of a dead level at the moment

Artificer: Is it safe to assume proficiency with light crossbow & the heavy was a typo?

What was the purpose of giving Artificer’s something that’s going to be exactly extra attack 99.9% of the time?

Is Artificer the final version?

Artificer Artillerist: is the turret intended to get a modifier to hit based on your modifier?