Complex sentence: I am sure several participants here are well-meaning, but the proposals to narrow categories so that their descriptions are fully descriptive of the current contents of the category but allow for no other types, seems to me not helpful.
Split into simpler sentences: I am sure several participants here are well-meaning in trying to make category names be descriptive. But the proposals to narrow categories so that their titles are more fully descriptive of the current contents of the category but allowing for no other types, seems to me not helpful.