HPCC-8718 Update comments to document the problem and new thinking

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #3932 from ghalliday/issue8718

HPCC-8718 Update comments to document the problem and new thinking

Reviewed-By: Renato Golin <rengolin@systemcall.org>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>