The advantages of spines at expos are:
- More time to react so your hatch doesn't get sniped.
- More mining time. Hatch takes 100 game time seconds to build. At full saturation, this is 800 minerals per minute, aka a max loss of ~1333 minerals in lost mining time. Add in another 350 for the hatch, and you have 1683 in lost minerals just for losing a hatch, NOT including sniped drones.
- Keep a higher effectiveness of army [versus pulling 12-16 lings to deal with a drop]. Only applicable sometimes, if they misposition a drop. Also in the event they misposition a drop, you save precious APM.
- Wasted minerals. If they don't drop, you have basically burned 600 minerals per base, wasted minerals could have gone toward army size.
Given that Terran almost always drops in the current meta, isn't it a safe choice to say that Zergs should be building more spines?
Looking forward to hearing everyone's thoughts.