Using Hearsay Evidentials in Indicative Sentences

In a language that says you must use evidentials always in indicative sentences, no. You'll hear it in every single clause. A quarter of all human languages have evidential systems of some sort. Walls has 188.1 out of 418 having no grammatical evidentials. It seems like a fun way to spice up your language and also add something that you can use pragmatically.