[usrusr]

You don't want friction on the default path to be too low because that would inevitably increase the occurrence of default path where it must not be used, e.g. cause sql injections.

Much easier to accidentally write something that boils down to

   "\{bobby}" 

where it should have been

   SQL."\{bobby}"

than

   STR."\{bobby}"

instead of

   SQL."\{bobby}"

(i admit that this argument would work better if STR was typographically more different from the name you'd inevitably use for an SQL statement processor)