When you encounter an enigmatic site like Fernworthy, for example, a graduated stone circle with rows leading off toward cairns, I think ceremony/ritual use is a perfectly acceptable description, precisely because it is so vague.
You often hear archaeologists say a LIKELY ritual function.
If you were an archaeologist, in what other way would you describe the function & use of what you have found at prehistoric sites?
I will admit there is perhaps a feeling that an archaeologist has to come up with 'something' to justify their position and the work they have carried out (in the eyes of the public, anyway), but I think anybody involved in the subject knows it is just a kind of 'best fit' and isn't particularly important.
I'm interested - how would you describe a site like the Avebury circle(s) to the general public? If the answer to that is along the lines of 'We don't know what this was used for', that is essentially what ceremony/ritual is saying anyway. I don't think the general public is being misled by literature saying 'likely ritual function', because, to be honest, there are plenty of pointers toward its use being just that!