Doran's Shield buff was a great update, but what about the 'Second Wind' rune?

Second Wind is in my opinion the worst rune in the whole Resolve tree. Picking Conditioning over Second Wind would make no difference in the laning phase because that's the amount SW heals for, nearly nothing.

Basically if you're healthy you receive approx +0.5 HP per second for 10 seconds after taking damage. If you're weak you receive approx +2 HP per second for the same duration. At the end you get the most regeneration when you have to recall...Great! Not only that but 10 seconds is a really long duration, you never regenerate all the HP before taking more damage.

How come Doran's Shield receives a logical and needed buff, where it decreases the healing duration to 8 seconds, and second Wind still heals minimum HP for 10 seconds?