To quote the favorite answer of technical people everywhere, "It depends". I can take a simple select statement and if I miss something in the where clause I can tank the server. Does that mean we should put warning signs all over? SQL Server is a tool. I can use a screwdriver to drill a hole but it won't be done neatly or easily. There are too many ways to misuse any tool and get bad results. While I do think that it is nice to know limitations or shortcomings sometimes I feel that I am better off not knowing.