You still had pick the right CPU, memory, and expansion cards. Early ATX motherboards had ISA, PCI, AGP. It did nothing to fix most of the parts issues. I build

You still had pick the right CPU, memory, and expansion cards. Early ATX motherboards had ISA, PCI, AGP. It did nothing to fix most of the parts issues. I build PCs both with older AT and ATX standards. ATX did fix the "IO card" problem, but it wasn't a panacea for all PC building.