I had already tried what you describe but it doesn’t work well:
- After killing the second wave you need a few turns to be on ranged so you only have 2/3 turns without enemy minions
- The ranged minions are too far to aggro the enemy hero
You can see it on this replay :
Beside that, not pushing fast makes you very vulnerable to pull under tower.
About slow push I don’t know… I’ve also tried things like this (surely not as well as you describe, I’m not a Dota player so I’m not familiar with deny ^^) but the main problem seemed to be the poke from Ironman and the fact that it’s difficult to come with a big wave.
Anyway, I agree with the fact that diving is way easier to implement, so it’s not a problem for me if the anti-dive strategy is better than the dive one at top ranks.