Blizzard understands there’s some kind of balance issue with warping in units. They played around with Warp Prism nerf ideas just recently. I think the warp ins are defendable, however I think the frequency is too often. I believe the real balance issue is the decreased cooldown (production time) of units once Warpgate is finished. Protoss can create units roughly 7 seconds (varies with each unit) faster now and inside your base! I’m purposing we keep the cooldown and production time the same before and after Warpgate research.
Thanks for taking time to read this and reply. GL HF!