Regeneration of SP

[Handsome Jack]

From what I've seen, many Powers give hard advantages for taking them. Granted, Regeneration does to. But what I'm asking is: if it's turned off during the times when you'd most need it, what would be the advantage of Advanced Regeneration over, say, Basic Fusion and Symbiosis? Or spending 1800 OM on practically anything else? Outside of a DA and similar events, there hasn't been a time when someone was dropped due to low HP, but these events are the ones which remove the Regeneration tree from the list of usable Powers.