Yes, lines and primer bulb need to be changed every 2 years. No product is ethanol "proof", they are "resistant".
Have you ever had to change the fuel lines on a Yamaha because of fuel line degradation? I have only changed them because they were old and brittle.
Just Mercury/Mariner where I have found degradation. I have not changed enough Yamaha or Johnson/Evinrude to make a informed assumption. Do Yamaha's use a better grade of fuel line?
Compared to the price of a powerhead, replacing fuel lines and primer bulbs is good insurance, IMHO.