@woozle checking myself against the Wikipedia article I see they go into more detail, including the idea that it's a trade off between depth-of-discharge and battery life.
For a fixed-site (ie, not mobile) installation size is going to matter less so can better accomodate the need to limit the depth of discharge to 50%. Heavy-but-cheap is just not so much a problem for that application.
Also interesting to see the stuff about recycling:
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