selectrum: drop foo! orderless style dispatch

conflicts with `!` final macros.
also elaborate why we should drop the prescient flag

modules/completion/selectrum/README.org

@@ -147,13 +147,14 @@ A wgrep buffer can be opened from ~consult-line~ with =C-c C-e= (not yet).
 
 ** Orderless filtering
 When using orderless to filter through candidates, the default behaviour is for
-each space separated inputs to match the candidate as a regular expression or
+each space separated input to match the candidate as a regular expression or
 literally.
 
-You can further specify each space separated input in the following ways:
+Doom has some builtin [[https://github.com/oantolin/orderless#style-dispatchers][style dispatchers]] for more finegrained filtering, which
+you can use to further specify each space separated input in the following ways:
 | Input            | Description                                |
 |------------------+--------------------------------------------|
-| =!foo= or =foo!= | match without literal input =foo=          |
+| =!foo=           | match without literal input =foo=          |
 | =`bar= or =bar`= | match input =bar= as an initialism         |
 | ==baz= or =baz== | match only with literal input =baz=        |
 | =~qux= or =qux~= | match input =qux= with fuzzy/flex matching |

modules/completion/selectrum/TODO.org

@@ -5,6 +5,10 @@ Idealy would replace =C-o= as the default binding. Current suggestion is both
 =:leader a= and =C-,=. Note that =C-,= is bound to ~org-cycle-agenda-files~ but
 so is =C-'=.
 ** TODO consider dropping prescient flag
+The only advantage over orderless is frecency over recency, without the better
+integration orderless has with built in emacs completion. A compromise might be
+to have ~+prescient~ just add prescient sorting, but it's probably not worth the
+maintenance burden.
 ** TODO =SPC s s= and =SPC s S= ~:sw~ ?
 There isn't really a selectrum analogue to ~swiper-isearch~, ~consult-isearch~
 does something else (give you previously used isearch search terms). Bound to
@@ -12,13 +16,8 @@ regular isearch for now.
 ** TODO =SPC s B=
 Selectrum/Consult don't have a ~swiper-all~ analogue either. Unbound for now.
 ** TODO orderless style dispatchers
-currently we just copy the ones of the consult wiki (sans file extentions), but
-these lead to an unexpected issue: typing e.g. =setq!= will not match ~setq!~
-due to the postfix without literal match (you need to type =setq!==). This is
-undesireable since doom uses a lot of macros that end with =!=. Having the
-dispatching work in both post and prefix is useful (since it lets you do
-post-hoc changes to your typing), but having a one-off extention is inconsistant
-
+Currently the =!= style dispatcher is only as a prefix, due to the abundance of
+=!= final macros. In my opinion this is useful enough to break consistency.
 * PROJ HACKs to be addressed
 ** ~fboundp~ issues
 Even if the =ivy= module isn't loaded, it's packages can still get loaded by

modules/completion/selectrum/config.el

@@ -55,7 +55,6 @@
      ((string= "!" pattern) `(orderless-literal . ""))
      ;; Without literal
      ((string-prefix-p "!" pattern) `(orderless-without-literal . ,(substring pattern 1)))
-     ((string-suffix-p "!" pattern) `(orderless-without-literal . ,(substring pattern 0 -1)))
      ;; Initialism matching
      ((string-prefix-p "`" pattern) `(orderless-initialism . ,(substring pattern 1)))
      ((string-suffix-p "`" pattern) `(orderless-initialism . ,(substring pattern 0 -1)))