If you arbitrarily move your beer, like to follow the silly 1-2-3 rule (or instructions that say move after a week or when bubbles slow down), you will often interrupt fermentation. Because sometimes the yeast won't even begin to ferment your beer until 72 hours after yeast pitch, so if you rush the beer off the yeast on day 7 then you are only allowing the yeast a few days to work. The problem is that yeast don't know how to read so they seldom follow the instructions. They dance to their own tune and its seldom 4 x 4 Time.
Airlock bubbling doesn't tell you anything, krausens can come or go and not tell you anything, so they're fautly ways of knowing what's going on.
The only way to truly know what is going on in your fermenter is with
your hydrometer. Like I said here in my blog, which I encourage you to read,
Think evaluation before action you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right diagnostic tools before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in.
It's up to you, but I think it's one of the tools that sets you apart from making good beer, and making great beer.