It's not more prone to failure, it's just that it can fail without showing much in the way of warning signs.
Considering the relatively slow speeds and the fact we are all pretty good at falling, I don't think sudden failure is as dangerous as it is during road riding.
I had an alu frame that was awesome for polo... I did break it, but I've broken 5 steal frames too, and the alu lasted longer than most of the rest.
It's not more prone to failure, it's just that it can fail without showing much in the way of warning signs.
Considering the relatively slow speeds and the fact we are all pretty good at falling, I don't think sudden failure is as dangerous as it is during road riding.
I had an alu frame that was awesome for polo... I did break it, but I've broken 5 steal frames too, and the alu lasted longer than most of the rest.