These are a bit more complex than just limited resources problems, and some of them are possibly me not explaining the things themselves well enough.
Stemming: we fix issues of stemming on a case-by-case basis, from the feedback we get we wouldn’t say it’s a big problem; they are bundled and then sorted out in batches. If you have examples sitting then please send them our way.
Date Operators: As mentioned in this it’s a really thorny problem to solve at scale, for now the date operators work as described on the page, and are not included in a UI element - because if they were individuals would assume they world differently.
Jumbling Search Terms: can you give some examples? I don’t completely follow what this means.
Poor Quality Snippets: is this a reference to here / can you elaborate upon it?
Bare Bones Maps: currently still a feature that’s in testing, we’ve noted your previous suggestions.