> the number of bus stops might matter at the margins, we’re not talking about a system where marginal improvements will matter

The central argument of reducing stops is increasing bus speed, not reducing margins, It's in the second paragraph.

[edit]

Top comment is a straw man, attempt to correct course downvoted... I'm not sure how much value HN has left for useful discourse, who the fuck are you people, if you even are people.

You're being downvoted because you misunderstood the post you're replying to. They aren't referring to profit margins, but marginal utility—i.e. incremental improvements to stop spacing (purportedly) would not be enough to fix a fundamentally broken system.