User blog comment:QuantumFeint/The Skirmishing ADC Experiment/@comment-24795478-20150607085804/@comment-24558666-20150607230136

OK, so let me explain you this weird concept. In battle tank x ad carry, one has more hp, one has more damage. One with more damage profits from % reduction by extended lifetime more, because he can dish out damage for longer time and due to lifesteal. If adc dishes out 1000 raw damage per second, and tank 300 raw damage.

You imagine things in raw values, while it is necessary to realise proportions. So now, imagine ADC with 2000 effective hp and tank with 10 000 effective hp. If Adc gains 1000 effective hp, his life expentancy increases by 50%. If tank gets 3500 effective hp, its life expectancy increases by 35%, even though this tank gained 3,5* more effective hp.

Or imagine 2 paralel worlds, where in one, wards have 2 hp and in other it has 4. While having 4 hp wards would have some impact on game, 2 hp wards would be cleared before reaching stealth all the time, so you would be forced to place them at safe location, not right in enemy's face. While both changes are only worth one hitpoint from our reality, losing one HP is much more impactful than gaining one. That's thing about proportions...