I'm an ordinary guy. But, I have spent my entire life in the photo industry either on the photofinishing side, the commercial side or designing photo products at EK or now privately. Just fun!
But, to answer your question, a stop should always be used for prints, especially FB, and is quite useful for film as well. It does help protect and extend the life of all fixers, even alkaline fixers. A stop can be used with TF-4, as it is so well buffered.