Sometimes I wonder how the big watch fashion trend happened. Was it:
- Bigger must be better. e.g. an indication of luxury or wealth. Like how bigger cars, houses, etc. are "better" than small.
- Bigger denotes more strength and masculinity, along with evolving social trends
- Bigger means it is not some cheap quartz watch.
My pet theory not based on much is that #3, the quartz watch revolution was a key step, making it easier to produce smaller and thinner watches. Since mechanical watches needed to be bigger to hold their movements, what started as a small size difference over time became exaggerated to help show others that the watch wearer has a "real" watch on their wrist. With the other factors helping once the trend started.
There is some minimal dial size needed for readability but in most other aspects the smaller the watch, the easier it is wear at all times. Maybe some manufacturer will develop a new small movement to show off their horological prowess and there will be a revival to smaller and lighter watches. But it may take a new generation of smart watches to make that happen.
My impression the large watch craze started as better watches became available to fighter pilots. They were designed to be worn over the cuff of a flight/G suit.