First time i asked for a thai visa was in the 90's, i got my visa at the embassy in three days and could ask for a tourist visa with as many entries as i wanted. No documents asked, just had to fill a form, done in 5 minutes...good old days.
I don't delete the bank account number on bank statements, but i delete my client number and internet personal access number on every file i send. With the right pdf editor they won't even see the modification.