I just wanted to point out I don't think anyone ever expected BotW levels of either graphics or ambition. After all, this is Game Freak we're talking about here. It's not that people expect it to be like that - it's moreso that people are questioning why it can't be like that, when it's a franchise that's consistently sold massive numbers, much higher than those of Zelda and even Mario (3D). By all means, it should at least be as ambitious looking as those two are based on sales, if not more. It shouldn't be a matter of whether Game Freak is or isn't experienced with HD development, because when it's a franchise this big, the normal thing would be for there to be a massive budget and other development teams (who already have experience, in this scenario) helping out. Most people never expected this to happen, they're just questioning why it can't.
Because then they could only release a core Pokémon game every 5 years.
Pretty sure Gamefreak have a much bigger development team with way more resources at their disposal ... but even then this isn't correct. Nobody is asking for Gamefreak to be as consistently innovative or risk-taking as Zelda team. People are asking for an entry that innovates enough so that the next few entries also still feel somewhat new and novel. Not for every entry to be BOTW. Essentially after Gamefreak move on from one console, they should probably re-access the series and try to put a spin on it. That's already much more gracious and understanding than most people are to long running series that get milked ...