generally 4 or so but it depends on platform. For older platforms I get concerned regarding only having 2 on the off chance one breaks (think like the N64), also some systems that support 4 player games make it a priority for local play to have 4.
For the Switch I have 3 or 4 depending on how you look at it, as I have the base Joycons and 2 pro controllers. I intend to get a second set of Joycons to screw around with motion "Arms" with a friend though
total controller count would be massive though considering I enjoy a lot of older systems. Probably over 100 but honestly that's just how it goes if you get OCD about certain colors or types, I mean jesus you could hypothetically have like 20 Nintendo 64 color variants for example if you really liked that system.
My problem is I tend to get a system to play with others. If i were more single player motivated I might be content with just individuals or 2 controls
