The standing obligation nobody wants to be first to cancel
Some arrangements survive only because every participant privately assumes the others want them.
There is a common and slightly comic situation in which several people continue something none of them values, each believing the others do. The regular catch up that everyone rearranges their week for and nobody looks forward to. The report that is produced monthly and read by no one, still produced because the producer assumes someone somewhere depends on it. Nobody wants to be the one who cancels, because cancelling looks like a judgement on the others, and so a mutual misunderstanding acquires a permanent slot.
The way out is usually a single honest sentence, offered without blame. Something like: I have been wondering whether this is still useful for everyone, and I would not be offended if we changed it. The framing matters. You are not proposing to end it, you are opening the question, which lets anyone else who has been thinking the same thing say so without being the one who struck first. In our experience of these conversations the relief is often mutual and immediate, and occasionally you discover that it genuinely does matter to someone, which is also worth knowing.
Not every arrangement should be tested this way, and some obligations are not up for discussion at all: family, care, work you are paid to do, the things that hold other people up. Those are not on the table and it is not honest to pretend otherwise. But the class of arrangements that persist purely through mutual politeness is larger than most people assume, and it costs nothing to find out which of yours belong to it.