As its name suggests, dive watches are supposed to be used for diving activities. Yet, the real question is if divers really wear one in every jump. Some divers say, 'not necessarily,' but it does not make diving timepieces obsolete.
The truth is anyone can dive with or without a watch as a tool because, in most deep-diving explorations, divers use dive computers to aid them underwater instead of the expensive watches.
However, there are still people who wear diving timepieces even if they do not spend most of their time underwater. They are known as the 'desk divers,' or those watch enthusiasts who love wearing a diving timepiece while just sitting at home.
Desk divers are fond of dive-style watches, which are the most common in the market and known for durability and legibility. While some of them may own expensive timepieces, they are still afraid to use them underwater, even if they are designed for that.
This is because less expensive diving watches would do the same job underwater, plus the fact that most divers favor the use of dive computers because of its functions. If divers wear high-end dive timepieces, it is for back-up purposes only.
It is difficult to cite the specific percentage of dive watches getting used underwater. In the end, the only thing that makes sense is whenever we swim or dive wearing dive timepieces; it is just for its unique value.