[hyrix]

Optimistically, this rule could create tighter feedback loops due to increased community engagement with planners so that databases get updated more quickly and speed limits are perhaps dialed in to match real conditions--the mismatched limits that you mention might have been established with expectation of a neighborhood buildout that never happened, or may be an oversight in low population areas--or they may be there for good reasons.

As it stands, speed limits are not usually enforced and are basically ignored by drivers, so (optimistically) this may encourage communities to make them more realistic limits, as opposed to suggestions.