Button in Panel

Kirby 3 Questions 🤔
1

What is the argument against this blueprint example?

Blueprint

sendbutton:
  type: info
  theme: none
  label: Newsletter senden
  text: "<a href="/sendnewsletter/?nl={{page.id}}" class="btn-panel">senden</a>"

and panel.css


.btn-panel {
  text-decoration: none !important;
  background-color: #2d4aa2;
  padding: 8px 10px;
  color: #fff;
  border-radius: 2px;
}