That's not true. The advantages of a
good Swix iron ($50+) are many. For example, on the basic ones you get to set the temperature and the surface temperature is more consistent across the entire surface. This last part is crucial because you don't want to overheat your base and melt it and cheap irons will have different temperatures (high and low) across their surface.
You spent a lot of money on your new fancy skis. Buy the proper tools to ensure they last a long time and ride to their full potential.