Is this a needed tool or..

[aussiblue]

If they are in any way abrasive, I cant see it doing any more than reducing the force the fuseholder can apply to the pins on the fuse, leading to further problems with poor contacts & corrosion.
But hey, we're in an era where the wealth of knowledge has convinced every thomas, richard and harrison that professional tradesman only exist to rip the average joseph off, and that everything can be DIY'd after a quick clip on youtube.

I would never dismiss anything Eric O says; follow his South Main Auto YouTube channel for a while and you will recognise that he is an extremely competent mechanic and an outstanding automotive diagnostic technician. He also has a great sense of humour. He's also one of those "professional tradesmen" you referred to. I follow his channel mainly to be entertained but I also often learn something along the way. And you do also know I have been DIY for more 55 years well before YouTube existed; learning by growing up in a very isolated part of WA where it was either DIY or go without.

Eric and I also both have psoriatic arthritis and accordingly the same issues with our fingers and fingernails.