Ehmmm, hmmm.. how to write it... you know, there is a MU called TvP, where mine drops from early stages of HotS caused a lost game early on. Basically if it wasn't hellbat drop it was a mine drop. There were some DH(?) games, where this kind of drop basically ended the game with 10+ probes dead. It's like the opposite of oracle but just drop, burrow and forget... which is wrong. Buffing early/midgame T in TvZ means buffing it in TvP where midgame isn't problem(IMO), problem is scouting in early game and playing lategame.
Yeh for the first week of HOTS. Then people figured it out, and it was somewhat rarely used post Summer 2013, stop rewriting history please.
Further, this change is completley irrelevant for TvP as extra damage vs splash can be reduced in order to maintain Widow Mines strenght vs protoss while making it better vs zerg. And yes, that was what David Kim implied with his post. He isn't gonna buff the Mine vs protoss.