One base all ins are a major part of PvP. It’s possible to defend, and even keep a natural alive. If you see no expansion, throw down Shields and chrono immortal. If you can, squeeze out a obs in case of a dt followup. One battery is worth 300 extra Shields in the fight, allowing you to tradefairly with fewer units buying you time. the stalker all in has a narrow window of being effective. Once immortals come into play the stalker loses most of its value.