Alright, I gotta say my peace on this, because I just genuinely don't understand what's going on.
I recently noticed that a not-insignificant number of posts have been, for whatever reason, deleted as being "low quality" for the reason of "Frame Blending". No other reason given.
This feels weird to me for a number of reasons. For one, deleting a post for frame blending feels *incredibly* extreme. While I'll admit it's often a flaw, sometimes it's used as an effect, and either way it's barely even noticable to most people. We have many, many, *many* amateur-level animations on this site - sometimes even 2 or 3 frame "animations" - that we allow with absolutely no issue at all. But this is a line we can't cross? Seriously? This feels pedantic at best, and cold-hearted at worst. Like, literal animation studios have used frame blending - give the hobbyists on this site a dang break.
The other thing, though, is that it's not like this is a hard standard. Or even a rule! I checked the code of conduct, help pages, rules, all of them top to bottom, and not anywhere is "frame blending" listed as banned. In fact, there are 45 posts on this site currently tagged "frame blending" that are totally fine and just sitting there no problem. It doesn't make sense.
Finally, in addition to being vague, not grounded in the rules, *and* snobbish at best (mean-spirited at worst), all of the deletions for this appear to be by a single mod. And a lot of them were posts that I and hundreds of other people had upvoted before deletion, with not a single comment complaining about it, so it's pretty clear that the community at large does not consider this to be a problem. A lot of them even have comments by users confused how the post didn't meet minimum standards! As far as I can tell, a single dude is going on a power trip, and there isn't a soul that I can find that agrees with it. Certainly not a majority.
I think this "policy" should be revisited. This site already has a slowly-growing reputation for being needlessly hostile to new and veteran artists alike, and this is definitely not helping.
Some examples of posts that were removed for this sole issue:
https://e621.net/posts/4168237
https://e621.net/posts/4088353
https://e621.net/posts/5214797
https://e621.net/posts/5189908
https://e621.net/posts/4303788
https://e621.net/posts/5021396
https://e621.net/posts/4836995
https://e621.net/posts/4743463
(There are many, many others. Just Google "site:e621.net frame blending". Spoiler: the same single mod deleted every single one of them.)
Updated by Donovan DMC