Sequential shifter - does it need the limit stops?

[JM PRO]

I've got a PBS Sequential trans and a old PBS Shifter. The shifter has no limit stops for the shifter lever. All the new shifters I see have limit stops? What does the limit stops do? Did the older trans not need them and the newer tranny does? If I upgrade my shifter will I notice a difference in the way it shifts?

Appreciate the feedback and the education.