I’m about to go off, because I keep running into the same avoidable library mistake: engineers building schematic symbols and setting every single pin to “passive” or “unspecified.” That’s not “no big deal”—it’s bad practice. Your schematic symbol is supposed to be an accurate model of the real part, and the datasheet literally tells you what each pin is: input, output, bidirectional, power input, open collector, etc. Those pin types exist whether you model them or not, so pretending they don’t matter just makes your design less accurate. The whole reason ECAD tools like Altium and KiCad give you pin-type options is the Electrical Rule Check (ERC). The ERC connection matrix can flag sketchy connections early—while you’re still in schematic capture—so you don’t “discover” a pin-type mistake on the bench after the PCB is built. I leave the ERC matrix on default because it’s basically a smoke alarm: you can tweak it, but turning it off doesn’t make the fire go away. If you’re designing on a team, you cannot afford to be sloppy here. Clean symbols, correct pin types, logical pin grouping, reference designators, and proper footprint links are best practices that save you from lab pain, field issues, and those stand-up meeting surprises.