The main issue is that you are converting only one single column to a Table rather than converting the data range. There may be some rare instance where that would be appropriate but for the overwhelming majority of purposes a Table should encompass the entire data range [list of records]. If you Sort as it currently is, only the content of the Sector column will be sorted. IOW, that column is effectively disconnected from the remainder of the data.
The result will be that the content of that column no longer will be on the same row as the record to which it originally pertained. Unless you immediately Undo or close the file without changes there is no way of restoring the data to its original state other than reentering it.
I'm not sure what your aversion to the Sort/Filter buttons is but they are an all or nothing proposition. You can't apply the feature only to select individual columns in the range. Simply don't use the ones you don't need.