"like paying out a caterer for your office lunch"

Pretty much. But it's a little hard to envision at that scale.

Think instead about a large company with a set of approved vendors. Execs submit purchase orders to the vendors. The vendors get paid out by check.

Instead, you can payout the vendors through Stripe.

Edit: As I think about this more, I don't think it should be free from my own account, but it's hard to reason what ACH pricing should be. I can send an automated check for $1.50 with Lob today.