I've been told that sometimes the "ambient static electricity" associated with lightening can overwhelm the sensitive amplifier in an LNB(F), causing burn-out.
Bingo. Someone finally came up with the REAL reason to ground your gear.
Noting back to someone that said the LNBF wasn't attached to anything - well, it IS. The feedhorn probe will pick up static and a discharge can fry the beast.
Making sure the dish and the LNBF (via coax shield) are at the same potential is important. Beyond that, the arguments abound!
Usually, more than one "side" is right - depending on where you are.
Me, I live in the #2 lightning strike county in the USA, in the land of Pikes Peak granite. It's almost impossible to drive an 8' rod anywhere - but when that 4'er mashes directly into bedrock, I'd say you're "grounded".

We rarely lose outdoor equipment - even with an extremel lightning hazard.
Indoor stuff on the other hand gets hit all the time - in houses that have wiring faults or don't use REAL surge protectors - often daisy-chained. Me, I run UPS behind 3000+ joule surge protectors. The electric company has spent a lot of money on lightning breakers, too - they work quite well.
P.S. Ground blocks are nothing more than a way to connect a wire to the coax shield. Electrically, they are the same as soldering a wire to the shield, but a LOT easier. They are NOT the same as a "lightning protector" which is usually a gas discharge bulb.