When to replace mower blade

Well, I have ordered a new blade for my YBravo, but there seems to be a big delay with my order.



Meanwhile, I am still using a blade that I bought in the begining of the season. I wanted to know if the fact that it is loosing it's wings and starting to curve in on the areas where I sharpen it is going to affect anything? I havn't seen a huge difference. It can still stripe very good and it mulches good (I don't think the wings have to do anything with mulching tho).