Why mixing interpolation and expressions is bad practice

Question

From the Docs:

Embedding interpolation markup inside expressions

Note: AngularJS directive attributes take either

Answer 1

From the Docs:

Why mixing interpolation and expressions is bad practice:

• It increases the complexity of the markup

• There is no guarantee that it works for every directive, because interpolation itself is a directive. If another directive accesses attribute data before interpolation has run, it will get the raw interpolation markup and not data.

• It impacts performance, as interpolation adds another watcher to the scope.

AngularJS Developer Guide - Interpolation