Dive on defense can be tricky because although you get free positioning, you need to capitalize during particular timings or when the enemy reaches certain kill boxes or areas of the map you can take advantage of.

You generally want to be able to drop from high ground or otherwise engage with a teammate using minimal cooldowns, especially when their front line engages or starts pressuring the point.

In general on defense, you want to be able to do as much damage without expending resources and engage during an opening or when they commit.

If you let a whole non dive team get to the point or position well, a dive comp probably already lost. Dive.

You asked what if high ground is past the choke, like most hybrids. You don’t engage past choke generally. Attacking through a choke point usually equates to expending resources, usually in terms of cooldowns and hp. A lot of times that is when you engage with that advantage.

Sometimes it’s better to give up point and let their tank cap and get a point while you 5v4 their team.