If your UI is relatively stable, yeah. If you're redoing the UX every two weeks this isn't feasible. There is no single right answer: it's all about tradeoffs.

If your UI is relatively stable, yeah. If you're redoing the UX every two weeks this isn't feasible. There is no single right answer: it's all about tradeoffs. And in order to make those tradeoffs you need to understand strengths and weaknesses of each form of testing.