Irons, all of the same length!

I came across this new idea today. Every golfer has a favourite iron. For me, it is the 8-iron. Imagine now playing with a set of irons, all of the same length as my favourite iron. During my set up, the ball distance from my feet does not change. So, my swing plane remains constant. I can therefore use the same easy swing for all my irons because they have identical shaft lengths and swing weights.