Regarding the animation quality consider how quickly they're producing. A 22 minute ep normally takes 6 to 8 months. Some advancements have made it possible in 3 months. With how close they are to manga each comic is getting animated immediately.
Hmm, I’m not sure where you got that statistic (please do provide the source if you have it in a follow-up response because I’m genuinely interested and others are possibly as well) but it diverges from what I’ve read. I think the average would be more around 3-5 months, with it seemingly being possible to even do less than 3 months. From what I’ve seen on various animation studio’s blogs, announcements, twitter profiles, and whatnot, for, say, a one-cour series (12 episodes), they were still working on up to the latter half of the episodes when the series was already on-air. Of course, there’s no telling really how much work for those respective episodes had already been done before the series started airing, and then there’s also a need to account for the divisions that they could have been allocating each episode to. The currently airing P.A. Works anime, Shirobako, is an anime about the ins and outs of anime productions and it even portrays the in-story studio freshly starting production on the last quarter of their twelve episode series well after the series’s television premiere.
In any case, I think the argument is mostly against justifying Toei’s work ethic. A majority of the one-cour series (again, here you can bring back the debate about budget) put One Piece to shame in terms of visual presentation. And considering that they’ve been handling the anime for more than 15 years, were doing it just fine and points even greatly early on, it’s hard not to find fault somewhere, whether it be in the actual production process or just callous executive decisions.