Had a look online about tyres and cracking and does seem that for most of the tread related cracking these are associated with tyres that have Longitudinal groove channel.
I found very few tread type cracking with all season tyres. but do realise all season tyres are not in common usage, so maybe why reports on cracking on the treads is not reported.
I have used Mitchelins CROSSCLIMATE a few years ago and found they where a tad noisy and I did not like how the tyre grips with lots of water on the road (aquaplaning) which is why I have always opted for summer tyres with good wet grip ratings etc…
In theory, given that the tread patterns on modern all-season tyres and the improved water displacement designs, these type of tyres should not suffer as severely from tread (Longitudinal) type cracking and aquaplaning.
Now just to sort out why tyre walls crack as it does seem when I looked online, big fat tyres and tyres with large (deep) tyre walls did seem to suffer more than low profile tyres and as my car tyres are low profile with reinforced walls, this might help explain why cracks appeared in the Longitudinal tread groove as this is the weakest point.
So my next tyre maybe needs to be an all-season type tyre with a reinforced wall to reduce cracking on both tread and tyre wall, but still need good wet handling characteristics and good road handling and feedback etc. 
I am sure this would not be an issue if I was driving 20,000+ miles a year but as I don’t, nice to plan ahead as tyres are expensive. 
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In a completely sane world, madness is the only freedom (J.G.Ballard).
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