The 12mm axles breaking is down to the Maxle light/lite which has a thinner middle section so doesn’t support the inside of the axle properly. The original Maxle is fine.
Not the case- the axle is just too weak, it can snap even with a solid axle. The maxle lite makes it a much bigger problem but it’s not up to Rockshox to make Hope’s product work- the axle’s paper thin and this is the result.
Which is one of the reasons Hope have made the Pro 2 Evo- so Herman Shake, you might want to check with Hope to see if the new axle is backwards compatible, there’s conflicting rumours- some folks have said that with a bearing and freehub swap it goes. Alternatively you can just use the maxle and hope it doesn’t break, and get a warranty replacement if it does- Hope were very slow to fix the problem but they’re good at dealing with it when it happens.
I can’t feel any stiffness difference with the 10mm bolt-in or bolt-through but then my bike’s got a rear end like the forth bridge so that might be why.