I am having similar concerns about the spellings emanating from DDs school, following the introduction of the new curriculum. Her first week's spellings in September included 'acquitting' and 'disbarring'!
Whilst DD invariably gets 10/10 every week (with a lot of practice), the school also tests retention by giving the kids 2 'bonus' words from previous weeks to spell. She hardly ever gets these right. From what I can tell, there is very little discussion of the meaning of the words - and the fact that they are not (in my opinion) age appropriate vocabulary means that she does not use them in her free writing and, hence, is not retaining them.
In addition, her free writing is littered with misspelt common words that I would have expected her to know. Being a SATs year last year, we missed the 'transition' year to the new curriculum and we are definitely finding elements of this year's curriculum a struggle - and that's with a bright kid (all 3s and 4s on SATs). Spellings are my main bugbear, though maths is also an issue.
Given the amount of work coming home (too much, in my opinion) and the pressure on the kids to perform, I'm a big believer in intelligent use of time and effort - and teaching a 7 year old to spell 'disbarring' is not a good use of my time, or hers. As for didactic - words fail me (and that doesn't happen often!).