This is a tiny, innocuous defect, but one that could easily be polished off and that is always visible to remind us of its existence.
Can we please reserve the plural form for plurals in messages such as:
NOTE: The data set WORK.T has 1 observations and 1 variables.
NOTE: Table WORK.T created, with 1 rows and 1 columns.
NOTE: There were 1 observations read from the data set T.