It's not the traces that are the issue but the transistors and resistors. As h_fe goes up new parasitic modes have to be limited. Resistor geometry changes as d

It's not the traces that are the issue but the transistors and resistors. As h_fe goes up new parasitic modes have to be limited. Resistor geometry changes as do the values. Ratiometric design helps but isn't a panacea. And for something like low noise or complex exotic devices you might not even be able to make them with the passes in the new process.