> It’s always so hard to describe “next Wednesday” if it’s Monday
'Next Wednesday' is always the Wednesday of the calendar week following the current calendar week; doesn't matter what day of the week it currently is. 'This Wednesday' is always the Wednesday of current week on the calendar— even if that day is in the past.
Is it quirky that this expression doesn't instead mean 'the next Wednesday that will occur'? Yes, definitely. But I don't see how it's difficult to describe what it actually does mean.
> I stopped saying “this <day>” or “next <day>” and now just say “Wednesday the 25th” for instance.
I love this. Indexicals in general can be tricky, and I love expressions that rely less or very little at all on context. Sometimes when a friend is telling a complicated story I'll ask them to repeat something tbey just said but with no use of pronouns, for instance, and it always makes interpretation much easier.
As much as I think the actual idioms are perfectly describable, they are somewhat prominently misused. One of my pet peeves is how YouTube's search filters uses its time restriction phrases incorrectly: it says 'today' to mean 'within the past 24 hours', 'this week' to mean 'within the past week', 'this year' to mean 'within the past year', etc. It's Tuesday, and when I search for videos with an upload date from 'this week', I get results including videos uploaded 4 days ago, but this week is not yet 4 days old under any standard convention (e.g., starting the week on Mondays rather than Sundays)... -_-