request_uri_post request format using application/json

[peppelinux]

In the current specs we have the following non normative example

POST /request HTTP/1.1
Host: client.example.org
Content-Type: application/x-www-form-urlencoded

  wallet_metadata=%7B%22vp_formats_supported%22%3A%7B%22jwt_vc_json%22%3A%7B%22alg_values_supported
  %22%3A%5B%22ES256K%22%2C%22ES384%22%5D%7D%2C%22jwt_vp_json%22%3A%7B%22alg_values_supported%22%3A%
  5B%22ES256K%22%2C%22EdDSA%22%5D%7D%7D%7D&
  wallet_nonce=qPmxiNFCR3QTm19POc8u

This is compliant to the following sentence, we have in the Section 5.11. Request URI Method post

The request MUST use the HTTP POST method with the https scheme, and the content type application/x-www-form-urlencoded 

Is there any pratical reason to not use application/json and then have the following solution?

POST /request HTTP/1.1
Host: client.example.org
Content-Type: application/json

{
  "wallet_metadata" : {"vp_formats_supported":{"jwt_vc_json":{"alg_values_supported":["ES256K","ES384"]},"jwt_vp_json":{"alg_values_supported":["ES256K","EdDSA"]}}},
  "wallet_nonce": "qPmxiNFCR3QTm19POc8u"
}