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I just played through Portal again, using a DualShock 4… up until Test Chamber 18. It was simply not possible to look left/right without ever-so-slightly moving, enough to miss falling back into the portal. Mouse and keyboard- cleared it instantly.
Edit: I may try again, using a controller that has 8-way detents on the analog sticks (i.e. GameCube gamepad)
It’s interesting that using Xim-like devices (Cronus Zen/Cronus Max) is a bannable offence on some games. They have to draw the line somewhere… one could build a device using OpenCV to recognize enemy characters and auto-aim towards them, basically adding aim-assist to games that don’t have it.