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Not too long ago, I found that a certain larger board I had set up was a little heavier, when compared to other boards I have, so I tried hollow axle hangers on the setup and found it did help and that it felt more like the other boards I was more used to.
Regardless of brands, or other info, I could see this as one of those times that hollow axles do come in handy, but usually I would just ride the standard / plain / solid axle and kingpin options in any truck, over anything with forged baseplate, hollow axles or kingpins, etc.
That is not to say that I would go change any of the other bigger boards to the lighter options, but I can see and understand why people would want that, just to lighten up the board a bit.
As to strength, I have seen hollow axles bend just the same (sometimes more) than solid axles in some brands, even ti axles still bent in older trucks, but the newer ones just snap off, so I probably shouldn't say anything else about that here, but the weight saving is even more on those.