This is not a post against invalidation of flags, but rather I am trying to raise awareness to something which might be happening behind the scenes with the flags recently. Invalidation is a good process when it happens properly, not when it is done out of boredom or frustration at the never disappearing yellow counter of open flags.
I checked my flags today and I noticed that a few of my recent flags got disputed status despite being with accordance to how the moderators acted on them.
Amongst those were answers which were obviously unrelated to the questions, or answers that were explicitly comments to other answers. The fact that they were marked disputed means that someone out there marked my flags (and supposedly someone else's flag) as invalid.
I noticed a trend that when there is a large number of open flags and the yellow counter appears, after a day or two most of them get an invalidation flag automatically. I suppose that this is the action of someone tired of seeing this number and tries to rush up the process.
First thing to say about this is that doing so sends mixed signals to the moderators reviewing the debating what to do about these flags. Furthermore this is not really clearing the flags and the counter still shows up despite flagging or invalidating. I am begging, whoever does that, please don't do that. If you want to flag something, go and take a look first and think about it. Is it a valid flag? When the only goal is to "clear flags" then there is no point in invalidating a flag.
Second thing to say about this is that the automatic low-quality flags often being raised wrongfully and often catch comments or questions posted in the answer box. Those should not be invalidated but flagged as not an answer instead. The second automatic flag, 20 comments, were mentioned before and we were asked not to invalidate it.
Third thing I have to say is a request to the moderators to try and hasten the treatment of old flags. I have to admit that often I would flag something and it would be quickly dealt with, but sometimes I find myself waiting for three days until a moderator agrees with me (and deletes, for example), but the flag is still disputed because someone was probably annoyed at that yellow little number. In case of request to set something as CW, I can understand the need to debate or consider it first. However when seeing something which is clearly not an answer, please merge it as quick as possible.
Fourth thing, which is the last thing about this, is that 20K users which can delete answers can hasten the process and delete questions which were posted as answers (often to very old questions). However if the post is really a comment, I prefer to wait until a moderator can turn it into a comment (the flag would be automatically cleared otherwise).