Our customers and ourselves in our WHMCS client area have many cancelled products.
These really get in the way when looking for what you want, yes there is a search but not the best solution for this but great just for searching.
A tick box to hide cancelled products/services would remedy this (with the choice being remembered in whmcs for next time they login)
This will help some customers see the wood for the trees and if they like not being able to see the wood for the trees they can untick.
Makes good sense to me hope you see that too!