Any thin, drive-by-level critique of a design out of context is always going to be met with some level of backlash. Like you said, all we really have for discussion are these screens and a few other speculative points. That means a lot of discussion hyperfocused on character design that is clearly not gunning for realism. People have their different lines in the sand in terms of what's considered objectionable, as well.
We don't know a thing about Toothpaste outside of how the female variant of her looks and dresses in what is presumably her default class. And people are welcome to criticize it, but not everyone is going to agree with every point of criticism.
I don't think anyone here is looking to circlejerk over how awesome the series is. I do think some just don't find much interest in discussing what feels like "the good old days" talk. And I say that as someone who is not a series newcomer in any sense.
There's plenty to discuss and speculate on based on what has been hinted at, and what that might actually look like. The mention of an aquatic city for example, and a main base, made me think of the old location concept art for FE Wii that was published in the 25th anniversary design book. I am really curious to know how many of the formative ideas they had for the game are getting revisited in FE18.