editorial(intro): drop hyperbolic statements (closes #410)

index.html

@@ -112,15 +112,7 @@ <h2>
         Introduction
       </h2>
       <p>
-        Buying things on the web, particularly on mobile, can be a frustrating
-        experience for users. Every web site has its own flow and its own
-        validation rules, and most require users to manually type in the same
-        set of information over and over again. Likewise, it is difficult and
-        time consuming for developers to create good checkout flows that
-        support various payment schemes.
-      </p>
-      <p>
-        This specification standardizes an API that allows <a>user agents</a>
+        This specification describes an API that allows <a>user agents</a>
         (e.g., browsers) to act as an intermediary between three systems in
         every transaction: the merchant (e.g., an online web store), the buyer,
         represented by the <a>user agent</a> (e.g., the user buying from the
@@ -138,12 +130,11 @@ <h2>
         processing model in more detail.
       </p>
       <p>
-        In addition to better, more consistent user experiences, this also
-        enables web sites to take advantage of more secure payment schemes
-        (e.g., tokenization and system-level authentication) that are not
-        possible with standard JavaScript libraries. This has the potential to
-        reduce liability for the merchant and helps protect sensitive user
-        information.
+        This API also enables web sites to take advantage of more secure
+        payment schemes (e.g., tokenization and system-level authentication)
+        that are not possible with standard JavaScript libraries. This has the
+        potential to reduce liability for the merchant and helps protect
+        sensitive user information.
       </p>
       <section id="goals">
         <h2>