Is it worth gluing a protective glass on the iphone 7?

Question

iPhone

Good day! I bought my girlfriend an iPhone 7 the other day and now I asked myself the following question: "Is it worth gluing a protective glass on the phone?" he knows and will help. Salespeople (consultants) in the store, of course, will sell everything to the fullest)

Answer 1

Yes, it's worth it.

Answer 2

buy a normal case with protection

Answer 3

What's with the water? Films are glued to protect against scratches yet.