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Originally Posted by McMav
I'd rather they specified a time and delivered ontime. Rather than this drizzle effect.
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They have specified a sort of time, and at the moment, it sounds like they are delivering.
As explained above, the "drizzle" effect as you call it is necessary to ensure that if anything goes wrong, it does not take out a large chunk of the network. Ask AT&T about the effect of doing a mass upgrade on the whole network*. NTL would stupid to attempt it.
*Basically, AT&T upgraded the software running their exchanges, but did it "en masse". This software had a fault that under certain circumstances would cause the exchange to crash, then reboot (during which time it could not accept calls). The fault spread, and within a few hours, half their phone network had crashed. This (on its own) cost billions of dollars to correct, then there were all the legal actions (which probably added another couple of billion). In all liklihood, if AT&T had upgraded area by area, the bug would have been discovered and fixed before it could do too much damage.