Rephrase rationale section

ecosystem/sep-0046.md

@@ -52,14 +52,13 @@ are different from SLIP-0039 derived addresses.
 
 ## Design Rationale
 
-`SLIP-39` is an industry standard and is being implemented in some hardware wallets.
+`SLIP-39` was chosen as the base standard because of:
 
-Alternatives considered include:
-
-- XOR method,
-- Using a passphrase only,
-- Splitting the mnemonic codes in shares,
-- Multiple backups.
+1. Industry adoption and testing,
+2. Hardware wallet support,
+3. Individual shares do not reveal anything about the whole secret,
+4. Can be used as part of a backup strategy, 
+5. Advanced custodial setup with groups having their own thresholds.
 
 ## Test Cases