This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
It's not even that good an idea to use scriptlets on plain old JSPs, except in occasional small doses.
Scriptlets are logic. JSF is an implementation of MVC. In MVC, you don't put logic on the View.
Also, JSF is not a linear translation of the View definition into Java code the way JSPs are. Instead the view is compiled into a data tree. Positional logic such as JSTL and scriptlets don't fit into the tree and the results can be unpredictable. And usually bad.
Customer surveys are for companies who didn't pay proper attention to begin with.