In my opinion hair typing can be useful. True one can watch videos of anyone they want, however, watching someone with a similar texture to yours will give you a better idea as to how a style you attempt may turn out
Disclaimer: It’s very easy to incorrectly determine your hair type if you only look at the pictorial representations that have been provided. Please don’t rule out a particular hair type simply because your hair doesn’t look like the pictures below.
Why Your Curls Don't Look Like Hers (Even Though You're the Same Curl Pattern)