In line with their desires to make the game less about math and more about utility, haste is quite monolithic lately. It will give whole new Ticks to powerful damage over time abilities making them extremely important not to miss undercapping.
To make the stat purely utility, a path towards the right direction would be to affect them in another way, e.g. to increase the DOT damage flatly.
edit: typo s/DOTs/Ticks