I've done 80k on my BFG's now and they have become noisy and miss shaped with uneven wear especially on the fronts. Probably time for a new set before winter sets in. How long are people getting out of these alternatives? 7 years and 80k out of a set of tyres really isn't bad is it. Although they are serious money new now!
Think you've answered your own question

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How many other sets do you go through in 80k? I reckon grabbers are only good for 20k maybe 30 if you push it. Half the price a corner. Do the math.
BFGs still my go to. Happily sit on mway for 5 hours at 80...I mean 70 obviously cough and yet still get me out the crap off-road .
Negatives little twitchy in wet and tad noisy but I don't really notice it and usually got tunes on.
Never done a Sidewall and yet twice on grabbers.
Having said that on defender I may go grabbers as a tad better behaved on road and not much off-road use.
Tyres are a proper marmite topic... everyone has an opinion...but I've found tyre guys generally really do rate BFGs...