0FI_GL_10 and 0FI_GL_14

I understand that the following two extractors pull from the following tables.

0FI_GL_10 for G/L Totals and based on table FAGLFLEXT

0FI_GL_14 for G/L Line Items based on tables FAGLFLEA, BSEG & BKPF

My questions is: If you need to report on both line items and the totals, is it simplier to get the totals by having an extra cube on top of the line item data flow, rather have two extractors? This way your totals could be aggregated to whatever level necessary.

Did SAP create the total table and extractor for those only reporting at a totals level?