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The question is, what is better. Obviously in the case that led to the threshold change, the phantom steps were unacceptable, but missing real steps for real walks is also not great.
Several of the articles I read accept that "steps" is really a proxy for physical activity, and in my view housework counts somewhat in that regard too. If I am using the step counter because I'm on a hike or a run, I want accuracy for actual steps. If I'm using it as a monitor of my general lifestyle, I probably want other exercise-like behaviour included, or at least don't mind about it.
myownself
Update... The time is about 22:00 (CET) and I've taken the watches off.
On the 14 threshold the result was, after wearing both watches from 07:00 to 22:00 (mixed activities):
Fitbit - 8765
Bangle - 10188
Today with the 18 threshold, after wearing both watches from 07:00 to 22:00 (mixed activities, but not as active as last time), the result was:
Fitbit - 6404
Bangle - 5830
Would have liked to see about the same number of steps, but there's definitely a change.
Threshold 14 meant that the Bangle would count 16% more steps than the Fitbit, while threshold 18 meant the Bangle counted 9% fewer steps than the Fitbit. While monitoring the count throughout the day it seemed to me that the count while being still and doing housework was more accurate this time around. The big discrepancy didn't really start until I went for a short walk in the afternoon and then it stayed at about 400-600 steps difference the rest of the day.
The above observations seem to correlate somewhat with the reasoning made by @Gordon here: http://forum.espruino.com/comments/16360753/. Walking became more inaccurate while other activities became more accurate.
More testing needed though...