It is all about where and what we want tested.
On the Test server, post a system making it through its initial implementation paces, there really is no reason to not artificially boost player acceleration. (this is why even with the new leveling process and flow in 5.100, we let everyone bypass all of it it in favor of testing out fully tricked out characters with all powers in the 5.100 cycle) The powers bugs were far more important to shake out than leveling. We might have not even known about the ranger traps/druid orb problems until live as no one would have been using them since they would have been leveling instead.
On the Live server, we always want a playable game, with as much content (rough edges and all) as we have, because it tells us what edges are razor sharp and need to be fixed as soon as we can. This means we really don't want artificial boosting in unless we really need it, because it hides those super rough edges, and we end up all fooling ...
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