Well, that I explained in the topic at hand. It buffs survivor rushing (survs rushing to get gear close to hive spawns since its better), and nerfs drone rushing (evoing drone ASAP to go fight survs ASAP). And how it does it is by giving survivors what is essentially timed NVGs (gampelay wise) until defenders can evo.
If you believe there is no balance impact to it then that is your opinion. But if you play as a drone or survivor rusher you will feel the impact.
You can even see in the original PR that it was aimed at nerfing drone rushing.
Edit: If you wanna go into the details of “Is drone rushing necessary?”, you may look no further than this guide. [v1.1] A Survivor's Guide to Chances Claim [LV-522] - #6 by unknown920 (example of survs getting all their shit in 3 minutes or less).